diff --git a/shadowsocks-libev-debian.sh b/shadowsocks-libev-debian.sh
index c8bd009..dc0f308 100644
--- a/shadowsocks-libev-debian.sh
+++ b/shadowsocks-libev-debian.sh
@@ -9,29 +9,60 @@ export PATH
 #   Intro:  https://teddysun.com/358.html                           #
 #===================================================================#
 
-clear
-echo
-echo "#############################################################"
-echo "# Install Shadowsocks-libev server for Debian or Ubuntu     #"
-echo "# Intro: https://teddysun.com/358.html                      #"
-echo "# Author: Teddysun <i@teddysun.com>                         #"
-echo "# Github: https://github.com/shadowsocks/shadowsocks-libev  #"
-echo "#############################################################"
-echo
-
-#Current folder
+# Current folder
 cur_dir=`pwd`
-shadowsocks_libev_ver="shadowsocks-libev-2.5.2"
 
 # Make sure only root can run our script
 rootness(){
-if [[ $EUID -ne 0 ]]; then
-    echo "Error:This script must be run as root!" 1>&2
-    exit 1
+    if [[ $EUID -ne 0 ]]; then
+       echo "Error: This script must be run as root!" 1>&2
+       exit 1
+    fi
+}
+
+# Disable selinux
+disable_selinux(){
+if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; then
+    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
+    setenforce 0
 fi
 }
 
-#Check system
+get_ip(){
+    local IP=$( ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1 )
+    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipv4.icanhazip.com )
+    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipinfo.io/ip )
+    [ ! -z ${IP} ] && echo ${IP} || echo
+}
+
+get_latest_version(){
+    ver=$(curl -s https://api.github.com/repos/shadowsocks/shadowsocks-libev/releases/latest | grep 'tag_name' | cut -d\" -f4)
+    [ -z ${ver} ] && echo "Error: Get shadowsocks-libev latest version failed" && exit 1
+    shadowsocks_libev_ver="shadowsocks-libev-$(echo ${ver} | sed -e 's/^[a-zA-Z]//g')"
+    download_link="https://github.com/shadowsocks/shadowsocks-libev/archive/${ver}.tar.gz"
+    init_script_link="https://raw.githubusercontent.com/teddysun/shadowsocks_install/master/shadowsocks-libev-debian"
+}
+
+check_installed(){
+    if [ "$(command -v "$1")" ]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+print_info(){
+    clear
+    echo "#############################################################"
+    echo "# Install Shadowsocks-libev server for Debian or Ubuntu     #"
+    echo "# Intro:  https://teddysun.com/358.html                     #"
+    echo "# Author: Teddysun <i@teddysun.com>                         #"
+    echo "# Github: https://github.com/shadowsocks/shadowsocks-libev  #"
+    echo "#############################################################"
+    echo
+}
+
+# Check system
 check_sys(){
     local checkType=$1
     local value=$2
@@ -77,110 +108,102 @@ check_sys(){
     fi
 }
 
-# Disable selinux
-disable_selinux(){
-if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; then
-    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
-    setenforce 0
-fi
-}
-
-get_ip(){
-    local IP=$( ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1 )
-    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipv4.icanhazip.com )
-    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipinfo.io/ip )
-    [ ! -z ${IP} ] && echo ${IP} || echo
-}
-
 # Pre-installation settings
 pre_install(){
     # Check OS system
-    if check_sys packageManager apt; then
-        #Set shadowsocks-libev config password
-        echo "Please input password for shadowsocks-libev:"
-        read -p "(Default password: teddysun.com):" shadowsockspwd
-        [ -z "$shadowsockspwd" ] && shadowsockspwd="teddysun.com"
-        echo
-        echo "---------------------------"
-        echo "password = $shadowsockspwd"
-        echo "---------------------------"
-        echo
-        #Set shadowsocks-libev config port
-        while true
-        do
-        echo -e "Please input port for shadowsocks-libev [1-65535]:"
-        read -p "(Default port: 8989):" shadowsocksport
-        [ -z "$shadowsocksport" ] && shadowsocksport="8989"
-        expr ${shadowsocksport} + 0 &>/dev/null
-        if [ $? -eq 0 ]; then
-            if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
-                echo
-                echo "---------------------------"
-                echo "port = ${shadowsocksport}"
-                echo "---------------------------"
-                echo
-                break
-            else
-                echo "Input error! Please input correct numbers."
-            fi
-        else
-            echo "Input error! Please input correct numbers."
-        fi
-        done
-        get_char(){
-            SAVEDSTTY=`stty -g`
-            stty -echo
-            stty cbreak
-            dd if=/dev/tty bs=1 count=1 2> /dev/null
-            stty -raw
-            stty echo
-            stty $SAVEDSTTY
-        }
-        echo
-        echo "Press any key to start...or Press Ctrl+C to cancel"
-        char=`get_char`
-        # Update System
-        apt-get -y update
-        # Install necessary dependencies
-        apt-get -y --no-install-recommends install wget unzip curl build-essential autoconf libtool openssl libssl-dev zlib1g-dev xmlto asciidoc libpcre3 libpcre3-dev
-        # Get IP address
-        echo "Getting Public IP address, Please wait a moment..."
-        echo -e "Your main public IP is\t\033[32m $(get_ip) \033[0m"
-        echo
-    else
+    if ! check_sys packageManager apt; then
         echo "Error: Your OS is not supported to run it! Please change OS to Debian/Ubuntu and try again."
         exit 1
     fi
+
+    # Check installed
+    check_installed "ss-server"
+    if [ $? -eq 0 ]; then
+        echo "Shadowsocks-libev has been installed, nothing to do..."
+        exit 0
+    fi
+
+    print_info
+
+    # Get shadowsocks-libev latest version
+    get_latest_version
+    echo "Get the latest version: ${shadowsocks_libev_ver}"
+    echo
+
+    #Set shadowsocks-libev config password
+    echo "Please input password for shadowsocks-libev:"
+    read -p "(Default password: teddysun.com):" shadowsockspwd
+    [ -z "${shadowsockspwd}" ] && shadowsockspwd="teddysun.com"
+    echo
+    echo "---------------------------"
+    echo "password = ${shadowsockspwd}"
+    echo "---------------------------"
+    echo
+
+    #Set shadowsocks-libev config port
+    while true
+    do
+    echo -e "Please input port for shadowsocks-libev [1-65535]:"
+    read -p "(Default port: 8989):" shadowsocksport
+    [ -z "$shadowsocksport" ] && shadowsocksport="8989"
+    expr ${shadowsocksport} + 0 &>/dev/null
+    if [ $? -eq 0 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
+            echo
+            echo "---------------------------"
+            echo "port = ${shadowsocksport}"
+            echo "---------------------------"
+            echo
+            break
+        else
+            echo "Input error, please input correct number"
+        fi
+    else
+        echo "Input error, please input correct numbers"
+    fi
+    done
+    get_char(){
+        SAVEDSTTY=`stty -g`
+        stty -echo
+        stty cbreak
+        dd if=/dev/tty bs=1 count=1 2> /dev/null
+        stty -raw
+        stty echo
+        stty $SAVEDSTTY
+    }
+    echo
+    echo "Press any key to start...or press Ctrl+C to cancel"
+    char=`get_char`
+    # Update System
+    apt-get -y update
+    # Install necessary dependencies
+    apt-get -y --no-install-recommends install curl build-essential autoconf libtool openssl libssl-dev zlib1g-dev xmlto asciidoc libpcre3 libpcre3-dev
+    echo
+    cd ${cur_dir}
 }
 
 # Download latest shadowsocks-libev
 download_files(){
-    if [ -f ${shadowsocks_libev_ver}.zip ];then
-        echo "${shadowsocks_libev_ver}.zip [found]"
+    if [ -f ${shadowsocks_libev_ver}.tar.gz ]; then
+        echo "${shadowsocks_libev_ver}.tar.gz [found]"
     else
-        if ! wget --no-check-certificate https://github.com/shadowsocks/shadowsocks-libev/archive/v2.5.2.zip -O ${shadowsocks_libev_ver}.zip; then
-            echo "Failed to download ${shadowsocks_libev_ver}.zip"
+        if ! wget --no-check-certificate -O ${shadowsocks_libev_ver}.tar.gz ${download_link}; then
+            echo "Failed to download ${shadowsocks_libev_ver}.tar.gz"
             exit 1
         fi
     fi
-    unzip -q ${shadowsocks_libev_ver}.zip
-    if [ $? -eq 0 ];then
-        cd ${cur_dir}/${shadowsocks_libev_ver}/
-        if ! wget --no-check-certificate https://raw.githubusercontent.com/teddysun/shadowsocks_install/master/shadowsocks-libev-debian; then
-            echo "Failed to download shadowsocks-libev start script!"
-            exit 1
-        fi
-    else
-        echo
-        echo "Unzip ${shadowsocks_libev_ver}.zip failed! Please visit https://teddysun.com/358.html and contact."
+
+    # Download init script
+    if ! wget --no-check-certificate -O /etc/init.d/shadowsocks ${init_script_link}; then
+        echo "Failed to download shadowsocks-libev init script!"
         exit 1
     fi
 }
 
 # Config shadowsocks
 config_shadowsocks(){
-    if [ ! -d /etc/shadowsocks-libev ];then
-        mkdir /etc/shadowsocks-libev
+    if [ ! -d /etc/shadowsocks-libev ]; then
+        mkdir -p /etc/shadowsocks-libev
     fi
     cat > /etc/shadowsocks-libev/config.json<<-EOF
 {
@@ -195,42 +218,34 @@ config_shadowsocks(){
 EOF
 }
 
-# Install 
-install_libev(){
-    # Build and Install shadowsocks-libev
-    if [ -s /usr/local/bin/ss-server ];then
-        echo "shadowsocks-libev has been installed!"
-        exit 0
-    else
-        ./configure
-        make && make install
+# Install Shadowsocks-libev
+install_shadowsocks(){
+    tar zxf ${shadowsocks_libev_ver}.tar.gz
+    cd ${shadowsocks_libev_ver}
+    ./configure
+    make && make install
+    if [ $? -eq 0 ]; then
+        chmod +x /etc/init.d/shadowsocks
+        update-rc.d -f shadowsocks defaults
+        # Run shadowsocks in the background
+        /etc/init.d/shadowsocks start
         if [ $? -eq 0 ]; then
-            # Add run on system start up
-            mv ${cur_dir}/${shadowsocks_libev_ver}/shadowsocks-libev-debian /etc/init.d/shadowsocks
-            chmod +x /etc/init.d/shadowsocks
-            update-rc.d -f shadowsocks defaults
-            # Run shadowsocks in the background
-            /etc/init.d/shadowsocks start
-            # Run success or not
-            if [ $? -eq 0 ]; then
-                echo "Shadowsocks-libev start success!"
-            else
-                echo "Shadowsocks-libev start failure!"
-            fi
+            echo "Shadowsocks-libev start success!"
         else
-            echo
-            echo "Shadowsocks-libev install failed! Please visit https://teddysun.com/358.html and contact."
-            exit 1
+            echo "Shadowsocks-libev start failure!"
         fi
+    else
+        echo
+        echo "Shadowsocks-libev install failed! Please visit https://teddysun.com/358.html and contact."
+        exit 1
     fi
+
     cd ${cur_dir}
-    # Delete shadowsocks-libev folder
-    rm -rf ${cur_dir}/${shadowsocks_libev_ver}/
-    # Delete shadowsocks-libev zip file
-    rm -f ${cur_dir}/${shadowsocks_libev_ver}.zip
+    rm -rf ${shadowsocks_libev_ver} ${shadowsocks_libev_ver}.tar.gz
+
     clear
     echo
-    echo "Congratulations, shadowsocks-libev install completed!"
+    echo "Congratulations, Shadowsocks-libev install completed!"
     echo -e "Your Server IP: \033[41;37m $(get_ip) \033[0m"
     echo -e "Your Server Port: \033[41;37m ${shadowsocksport} \033[0m"
     echo -e "Your Password: \033[41;37m ${shadowsockspwd} \033[0m"
@@ -241,7 +256,6 @@ install_libev(){
     echo "Welcome to visit:https://teddysun.com/358.html"
     echo "Enjoy it!"
     echo
-    exit 0
 }
 
 # Install Shadowsocks-libev
@@ -251,27 +265,26 @@ install_shadowsocks_libev(){
     pre_install
     download_files
     config_shadowsocks
-    install_libev
+    install_shadowsocks
 }
 
 # Uninstall Shadowsocks-libev
 uninstall_shadowsocks_libev(){
-    printf "Are you sure uninstall Shadowsocks-libev? (y/n) "
+    clear
+    print_info
+    printf "Are you sure uninstall Shadowsocks-libev? (y/n)"
     printf "\n"
     read -p "(Default: n):" answer
-    if [ -z $answer ]; then
-        answer="n"
-    fi
-    if [ "$answer" = "y" ]; then
-        ps -ef | grep -v grep | grep -v ps | grep -i "ss-server" > /dev/null 2>&1
+    [ -z ${answer} ] && answer="n"
+
+    if [ "${answer}" == "y" ] || [ "${answer}" == "Y" ]; then
+        ps -ef | grep -v grep | grep -i "ss-server" > /dev/null 2>&1
         if [ $? -eq 0 ]; then
             /etc/init.d/shadowsocks stop
         fi
-        # remove auto start script
         update-rc.d -f shadowsocks remove
-        # delete config file
-        rm -rf /etc/shadowsocks-libev
-        # delete shadowsocks
+
+        rm -fr /etc/shadowsocks-libev
         rm -f /usr/local/bin/ss-local
         rm -f /usr/local/bin/ss-tunnel
         rm -f /usr/local/bin/ss-server
@@ -293,7 +306,9 @@ uninstall_shadowsocks_libev(){
         rm -f /etc/init.d/shadowsocks
         echo "Shadowsocks-libev uninstall success!"
     else
-        echo "uninstall cancelled, Nothing to do"
+        echo
+        echo "uninstall cancelled, nothing to do..."
+        echo
     fi
 }
 
@@ -301,14 +316,14 @@ uninstall_shadowsocks_libev(){
 action=$1
 [ -z $1 ] && action=install
 case "$action" in
-install)
+    install)
     install_shadowsocks_libev
     ;;
-uninstall)
+    uninstall)
     uninstall_shadowsocks_libev
     ;;
-*)
-    echo "Arguments error! [${action} ]"
+    *)
+    echo "Arguments error! [${action}]"
     echo "Usage: `basename $0` {install|uninstall}"
     ;;
 esac
diff --git a/shadowsocks-libev.sh b/shadowsocks-libev.sh
index 17d4f8b..4563534 100644
--- a/shadowsocks-libev.sh
+++ b/shadowsocks-libev.sh
@@ -9,28 +9,60 @@ export PATH
 #   Intro:  https://teddysun.com/357.html                           #
 #===================================================================#
 
-clear
-echo "#############################################################"
-echo "# Install Shadowsocks-libev server for CentOS 6 or 7        #"
-echo "# Intro: https://teddysun.com/357.html                      #"
-echo "# Author: Teddysun <i@teddysun.com>                         #"
-echo "# Github: https://github.com/shadowsocks/shadowsocks-libev  #"
-echo "#############################################################"
-echo
-
-#Current folder
+# Current folder
 cur_dir=`pwd`
-shadowsocks_libev_ver="shadowsocks-libev-2.5.2"
 
 # Make sure only root can run our script
 rootness(){
-if [[ $EUID -ne 0 ]]; then
-   echo "Error:This script must be run as root!" 1>&2
-   exit 1
+    if [[ $EUID -ne 0 ]]; then
+       echo "Error: This script must be run as root!" 1>&2
+       exit 1
+    fi
+}
+
+# Disable selinux
+disable_selinux(){
+if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; then
+    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
+    setenforce 0
 fi
 }
 
-#Check system
+get_ip(){
+    local IP=$( ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1 )
+    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipv4.icanhazip.com )
+    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipinfo.io/ip )
+    [ ! -z ${IP} ] && echo ${IP} || echo
+}
+
+get_latest_version(){
+    ver=$(curl -s https://api.github.com/repos/shadowsocks/shadowsocks-libev/releases/latest | grep 'tag_name' | cut -d\" -f4)
+    [ -z ${ver} ] && echo "Error: Get shadowsocks-libev latest version failed" && exit 1
+    shadowsocks_libev_ver="shadowsocks-libev-$(echo ${ver} | sed -e 's/^[a-zA-Z]//g')"
+    download_link="https://github.com/shadowsocks/shadowsocks-libev/archive/${ver}.tar.gz"
+    init_script_link="https://raw.githubusercontent.com/teddysun/shadowsocks_install/master/shadowsocks-libev"
+}
+
+check_installed(){
+    if [ "$(command -v "$1")" ]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+print_info(){
+    clear
+    echo "#############################################################"
+    echo "# Install Shadowsocks-libev server for CentOS 6 or 7        #"
+    echo "# Intro:  https://teddysun.com/357.html                     #"
+    echo "# Author: Teddysun <i@teddysun.com>                         #"
+    echo "# Github: https://github.com/shadowsocks/shadowsocks-libev  #"
+    echo "#############################################################"
+    echo
+}
+
+# Check system
 check_sys(){
     local checkType=$1
     local value=$2
@@ -78,7 +110,7 @@ check_sys(){
 
 # Get version
 getversion(){
-    if [[ -s /etc/redhat-release ]];then
+    if [[ -s /etc/redhat-release ]]; then
         grep -oE  "[0-9.]+" /etc/redhat-release
     else
         grep -oE  "[0-9.]+" /etc/issue
@@ -91,7 +123,7 @@ centosversion(){
         local code=$1
         local version="$(getversion)"
         local main_ver=${version%%.*}
-        if [ "$main_ver" == "$code" ];then
+        if [ "$main_ver" == "$code" ]; then
             return 0
         else
             return 1
@@ -101,21 +133,6 @@ centosversion(){
     fi
 }
 
-# Disable selinux
-disable_selinux(){
-if [ -s /etc/selinux/config ] && grep 'SELINUX=enforcing' /etc/selinux/config; then
-    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
-    setenforce 0
-fi
-}
-
-get_ip(){
-    local IP=$( ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1 )
-    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipv4.icanhazip.com )
-    [ -z ${IP} ] && IP=$( wget -qO- -t1 -T2 ipinfo.io/ip )
-    [ ! -z ${IP} ] && echo ${IP} || echo
-}
-
 # Pre-installation settings
 pre_install(){
     # Check OS system
@@ -126,38 +143,54 @@ pre_install(){
             exit 1
         fi
     else
-        echo "Error: Your OS is not supported to run it! Please change OS to CentOS and try again."
+        echo "Error: Your OS is not supported to run it, please change OS to CentOS and try again."
         exit 1
     fi
-    #Set shadowsocks-libev config password
-    echo "Please input password for shadowsocks-libev:"
+
+    # Check installed
+    check_installed "ss-server"
+    if [ $? -eq 0 ]; then
+        echo "Shadowsocks-libev has been installed, nothing to do..."
+        exit 0
+    fi
+
+    print_info
+
+    # Get shadowsocks-libev latest version
+    get_latest_version
+    echo "Get the latest version: ${shadowsocks_libev_ver}"
+    echo
+
+    # Set shadowsocks-libev config password
+    echo "Please input password for shadowsocks-libev"
     read -p "(Default password: teddysun.com):" shadowsockspwd
-    [ -z "$shadowsockspwd" ] && shadowsockspwd="teddysun.com"
+    [ -z "${shadowsockspwd}" ] && shadowsockspwd="teddysun.com"
     echo
     echo "---------------------------"
-    echo "password = $shadowsockspwd"
+    echo "password = ${shadowsockspwd}"
     echo "---------------------------"
     echo
-    #Set shadowsocks-libev config port
+
+    # Set shadowsocks-libev config port
     while true
     do
-    echo -e "Please input port for shadowsocks-libev [1-65535]:"
+    echo -e "Please input port for shadowsocks-libev [1-65535]"
     read -p "(Default port: 8989):" shadowsocksport
     [ -z "$shadowsocksport" ] && shadowsocksport="8989"
-    expr $shadowsocksport + 0 &>/dev/null
+    expr ${shadowsocksport} + 0 &>/dev/null
     if [ $? -eq 0 ]; then
-        if [ $shadowsocksport -ge 1 ] && [ $shadowsocksport -le 65535 ]; then
+        if [ ${shadowsocksport} -ge 1 ] && [ ${shadowsocksport} -le 65535 ]; then
             echo
             echo "---------------------------"
-            echo "port = $shadowsocksport"
+            echo "port = ${shadowsocksport}"
             echo "---------------------------"
             echo
             break
         else
-            echo "Input error! Please input correct numbers."
+            echo "Input error, please input correct number"
         fi
     else
-        echo "Input error! Please input correct numbers."
+        echo "Input error, please input correct number"
     fi
     done
     get_char(){
@@ -170,47 +203,36 @@ pre_install(){
         stty $SAVEDSTTY
     }
     echo
-    echo "Press any key to start...or Press Ctrl+C to cancel"
+    echo "Press any key to start...or press Ctrl+C to cancel"
     char=`get_char`
     #Install necessary dependencies
-    yum install -y wget unzip openssl-devel gcc swig python python-devel python-setuptools
-    yum install -y autoconf libtool libevent xmlto asciidoc pcre pcre-devel make curl curl-devel
-    yum install -y automake zlib-devel openssl-devel perl perl-devel cpio expat-devel gettext-devel
-    # Get IP address
-    echo "Getting Public IP address, Please wait a moment..."
-    echo -e "Your main public IP is\t\033[32m $(get_ip) \033[0m"
+    yum install -y unzip autoconf automake make zlib-devel curl curl-devel libtool libevent xmlto asciidoc pcre pcre-devel openssl-devel gcc perl perl-devel cpio expat-devel gettext-devel
     echo
+    cd ${cur_dir}
 }
 
 # Download latest shadowsocks-libev
 download_files(){
-    if [ -f ${shadowsocks_libev_ver}.zip ];then
-        echo "${shadowsocks_libev_ver}.zip [found]"
+    if [ -f ${shadowsocks_libev_ver}.tar.gz ]; then
+        echo "${shadowsocks_libev_ver}.tar.gz [found]"
     else
-        if ! wget --no-check-certificate https://github.com/shadowsocks/shadowsocks-libev/archive/v2.5.2.zip -O ${shadowsocks_libev_ver}.zip; then
-            echo "Failed to download ${shadowsocks_libev_ver}.zip"
+        if ! wget --no-check-certificate -O ${shadowsocks_libev_ver}.tar.gz ${download_link}; then
+            echo "Failed to download ${shadowsocks_libev_ver}.tar.gz"
             exit 1
         fi
     fi
-    unzip -q ${shadowsocks_libev_ver}.zip
-    if [ $? -eq 0 ];then
-        cd ${cur_dir}/${shadowsocks_libev_ver}/
-    else
-        echo
-        echo "Unzip ${shadowsocks_libev_ver}.zip failed! Please visit https://teddysun.com/357.html and contact."
-        exit 1
-    fi
-    # Download start script
-    if ! wget --no-check-certificate https://raw.githubusercontent.com/teddysun/shadowsocks_install/master/shadowsocks-libev; then
-        echo "Failed to download shadowsocks-libev start script!"
+
+    # Download init script
+    if ! wget --no-check-certificate -O /etc/init.d/shadowsocks ${init_script_link}; then
+        echo "Failed to download shadowsocks-libev init script!"
         exit 1
     fi
 }
 
 # Config shadowsocks
 config_shadowsocks(){
-    if [ ! -d /etc/shadowsocks-libev ];then
-        mkdir /etc/shadowsocks-libev
+    if [ ! -d /etc/shadowsocks-libev ]; then
+        mkdir -p /etc/shadowsocks-libev
     fi
     cat > /etc/shadowsocks-libev/config.json<<-EOF
 {
@@ -225,7 +247,7 @@ config_shadowsocks(){
 EOF
 }
 
-# firewall set
+# Firewall set
 firewall_set(){
     echo "firewall set start..."
     if centosversion 6; then
@@ -245,14 +267,14 @@ firewall_set(){
         fi
     elif centosversion 7; then
         systemctl status firewalld > /dev/null 2>&1
-        if [ $? -eq 0 ];then
+        if [ $? -eq 0 ]; then
             firewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/tcp
             firewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/udp
             firewall-cmd --reload
         else
             echo "Firewalld looks like not running, try to start..."
             systemctl start firewalld
-            if [ $? -eq 0 ];then
+            if [ $? -eq 0 ]; then
                 firewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/tcp
                 firewall-cmd --permanent --zone=public --add-port=${shadowsocksport}/udp
                 firewall-cmd --reload
@@ -264,42 +286,36 @@ firewall_set(){
     echo "firewall set completed..."
 }
 
-# Install 
-install(){
-    # Build and Install shadowsocks-libev
-    if [ -s /usr/local/bin/ss-server ];then
-        echo "shadowsocks-libev has been installed!"
-        exit 0
-    else
-        ./configure
-        make && make install
+# Install Shadowsocks-libev
+install_shadowsocks(){
+    tar zxf ${shadowsocks_libev_ver}.tar.gz
+    cd ${shadowsocks_libev_ver}
+    ./configure
+    make && make install
+    if [ $? -eq 0 ]; then
+        chmod +x /etc/init.d/shadowsocks
+        # Add run on system start up
+        chkconfig --add shadowsocks
+        chkconfig shadowsocks on
+        # Start shadowsocks
+        /etc/init.d/shadowsocks start
         if [ $? -eq 0 ]; then
-            mv ${cur_dir}/${shadowsocks_libev_ver}/shadowsocks-libev /etc/init.d/shadowsocks
-            chmod +x /etc/init.d/shadowsocks
-            # Add run on system start up
-            chkconfig --add shadowsocks
-            chkconfig shadowsocks on
-            # Start shadowsocks
-            /etc/init.d/shadowsocks start
-            if [ $? -eq 0 ]; then
-                echo "Shadowsocks-libev start success!"
-            else
-                echo "Shadowsocks-libev start failure!"
-            fi
+            echo "Shadowsocks-libev start success!"
         else
-            echo
-            echo "Shadowsocks-libev install failed! Please visit https://teddysun.com/357.html and contact."
-            exit 1
+            echo "Shadowsocks-libev start failure!"
         fi
+    else
+        echo
+        echo "Shadowsocks-libev install failed! Please visit https://teddysun.com/357.html and contact."
+        exit 1
     fi
+
     cd ${cur_dir}
-    # Delete shadowsocks-libev folder
-    rm -rf ${cur_dir}/${shadowsocks_libev_ver}/
-    # Delete shadowsocks-libev zip file
-    rm -f ${cur_dir}/${shadowsocks_libev_ver}.zip
+    rm -rf ${shadowsocks_libev_ver} ${shadowsocks_libev_ver}.tar.gz
+
     clear
     echo
-    echo "Congratulations, shadowsocks-libev install completed!"
+    echo "Congratulations, Shadowsocks-libev install completed!"
     echo -e "Your Server IP: \033[41;37m $(get_ip) \033[0m"
     echo -e "Your Server Port: \033[41;37m ${shadowsocksport} \033[0m"
     echo -e "Your Password: \033[41;37m ${shadowsockspwd} \033[0m"
@@ -310,26 +326,23 @@ install(){
     echo "Welcome to visit:https://teddysun.com/357.html"
     echo "Enjoy it!"
     echo
-    exit 0
 }
 
 # Uninstall Shadowsocks-libev
 uninstall_shadowsocks_libev(){
-    printf "Are you sure uninstall shadowsocks_libev? (y/n) "
+    print_info
+    printf "Are you sure uninstall shadowsocks-libev? (y/n)"
     printf "\n"
     read -p "(Default: n):" answer
-    if [ -z $answer ]; then
-        answer="n"
-    fi
-    if [ "$answer" = "y" ]; then
-        ps -ef | grep -v grep | grep -v ps | grep -i "ss-server" > /dev/null 2>&1
+    [ -z ${answer} ] && answer="n"
+
+    if [ "${answer}" == "y" ] || [ "${answer}" == "Y" ]; then
+        ps -ef | grep -v grep | grep -i "ss-server" > /dev/null 2>&1
         if [ $? -eq 0 ]; then
             /etc/init.d/shadowsocks stop
         fi
         chkconfig --del shadowsocks
-        # delete config file
-        rm -rf /etc/shadowsocks-libev
-        # delete shadowsocks
+        rm -fr /etc/shadowsocks-libev
         rm -f /usr/local/bin/ss-local
         rm -f /usr/local/bin/ss-tunnel
         rm -f /usr/local/bin/ss-server
@@ -351,7 +364,9 @@ uninstall_shadowsocks_libev(){
         rm -f /etc/init.d/shadowsocks
         echo "Shadowsocks-libev uninstall success!"
     else
-        echo "uninstall cancelled, Nothing to do"
+        echo
+        echo "uninstall cancelled, nothing to do..."
+        echo
     fi
 }
 
@@ -363,21 +378,21 @@ install_shadowsocks_libev(){
     download_files
     config_shadowsocks
     firewall_set
-    install
+    install_shadowsocks
 }
 
 # Initialization step
 action=$1
 [ -z $1 ] && action=install
 case "$action" in
-install)
+    install)
     install_shadowsocks_libev
     ;;
-uninstall)
+    uninstall)
     uninstall_shadowsocks_libev
     ;;
-*)
-    echo "Arguments error! [${action} ]"
+    *)
+    echo "Arguments error! [${action}]"
     echo "Usage: `basename $0` {install|uninstall}"
     ;;
 esac