diff --git a/lemp.sh b/lemp.sh
index f94ed03..5cc0660 100755
--- a/lemp.sh
+++ b/lemp.sh
@@ -1,137 +1,68 @@
 #!/bin/bash
  
-# Install script for LEMP Web Server base on CentOS 6/7 by xiaosong
-cd `pwd`
+# Install script for LEMP Web Server base on CentOS 7 by xiaosong
+
+SCRIPT_ROOT=`pwd`
+cd `${SCRIPT_ROOT}`
 
 while :; do echo
-    read -p "Please type MariaDB root password:(Default lemp.sh press Enter) " MariaDB_ROOT_PWD
-    [ -z "$MariaDB_ROOT_PWD" ] && MariaDB_ROOT_PWD="lemp.sh"
-    [ -n "`echo $MariaDB_ROOT_PWD | grep '[+|&]'`" ] && { echo "${CWARNING}input error,not contain a plus sign (+) and & ${CEND}"; continue; }
-    break;
+  read -p "Do you want to init your CentOS? [y/n]: " init_yn
+  if [[ ! $init_yn =~ ^[y,n]$ ]]; then
+    echo "${CWARNING}input error! Please only input 'y' or 'n'${CEND}"
+  else
+    break
+  fi
 done
 
+while :; do echo
+  read -p "Do you want to install nginx? [y/n]: " nginx_yn
+  if [[ ! $nginx_yn =~ ^[y,n]$ ]]; then
+    echo "${CWARNING}input error! Please only input 'y' or 'n'${CEND}"
+  else
+    break
+  fi
+done
+
+while :; do echo
+  read -p "Do you want to install PHP? [y/n]: " php_yn
+  if [[ ! $php_yn =~ ^[y,n]$ ]]; then
+    echo "${CWARNING}input error! Please only input 'y' or 'n'${CEND}"
+  else
+    break
+  fi
+done
+
+while :; do echo
+  read -p "Do you want to install MariaDB? [y/n]: " mariadb_yn
+  if [[ ! $mariadb_yn =~ ^[y,n]$ ]]; then
+    echo "${CWARNING}input error! Please only input 'y' or 'n'${CEND}"
+  else
+    while :; do echo
+        read -p "Please type MariaDB root password:(Default lemp.sh press Enter) " MariaDB_ROOT_PWD
+        [ -z "$MariaDB_ROOT_PWD" ] && MariaDB_ROOT_PWD="lemp.sh"
+        [ -n "`echo $MariaDB_ROOT_PWD | grep '[+|&]'`" ] && { echo "${CWARNING}input error,not contain a plus sign (+) and & ${CEND}"; continue; }
+        break;
+    done
+  fi
+done
+
+if [ "$init_yn" == 'y' ]; then
 . ./utils/init.sh
+fi
 
 # Install base packages
 echo "Installing base packages..."
 sudo yum -y update
 sudo yum -y install vim wget epel-release unzip git
 
-# Install the Required Repositories
-echo "Installing the Required Repositories..."
-sudo rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-${CentOS_RHEL_version}.rpm
-
-echo "[nginx]
-name=nginx repo
-baseurl=http://nginx.org/packages/centos/\$releasever/\$basearch/
-gpgcheck=0
-enabled=1" > /etc/yum.repos.d/nginx.repo
-
-# Install MariaDB
-echo "Installing MariaDB..."
-sudo yum install -y mariadb-server
-
-# Install Nginx
-echo "Installing Nginx..."
-sudo yum install -y nginx
-
-# Install PHP
-echo "Installing PHP..."
-sudo yum install -y --enablerepo=remi,remi-php71 php-gd php-fpm php-cli php-pdo php-xml php-json php-common php-mcrypt php-mysqlnd php-mbstring php-zip php-opcache php-xmlrpc
-
-# Install Composer
-echo "Installing Composer globally..."
-curl -sS https://getcomposer.org/installer | php
-sudo mv composer.phar /usr/bin/composer
-
-# Configure Nginx for PHP
-echo "Configuring Nginx for PHP..."
-IP=`curl -4 ip.llm.me`
-sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak
-sudo cp /etc/nginx/conf.d/default.conf /etc/nginx/conf.d/default.conf.bak
-sudo cp ./conf/nginx.conf /etc/nginx/nginx.conf
-sudo cp ./conf/default.conf /etc/nginx/conf.d/default.conf
-sudo sed -i "s/localhost/$IP `hostname`/g" /etc/nginx/conf.d/default.conf
-
-# Configure PHP
-echo "Configuring PHP..."
-sudo chown root:nginx /var/lib/php -R
-sudo sed -i 's/;cgi.fix_pathinfo=1/cgi.fix_pathinfo = 0/g' /etc/php.ini
-sudo sed -i 's/pdo_mysql.default_socket=/pdo_mysql.default_socket = \/var\/lib\/mysql\/mysql.sock/g' /etc/php.ini
-sudo sed -i 's/mysqli.default_socket =/mysqli.default_socket = \/var\/lib\/mysql\/mysql.sock/g' /etc/php.ini
-sudo sed -i 's/upload_max_filesize = 2M/upload_max_filesize = 20M/g' /etc/php.ini
-sudo sed -i 's/post_max_size = 8M/post_max_size = 50M/g' /etc/php.ini
-sudo sed -i 's/;date.timezone =/date.timezone = "Asia\/Shanghai"/g' /etc/php.ini
-sudo sed -i 's/expose_php = On/expose_php = Off/g' /etc/php.ini
-sudo sed -i 's/user = apache/user = nginx/g' /etc/php-fpm.d/www.conf
-sudo sed -i 's/group = apache/group = nginx/g' /etc/php-fpm.d/www.conf
-sudo sed -i 's/listen = 127.0.0.1:9000/listen = \/var\/run\/php-fpm.sock/g' /etc/php-fpm.d/www.conf
-sudo sed -i 's/;listen.owner = nobody/listen.owner = nginx/g' /etc/php-fpm.d/www.conf
-sudo sed -i 's/;listen.group = nobody/listen.group = nginx/g' /etc/php-fpm.d/www.conf
-sudo sed -i 's/;listen.mode = 0660/listen.mode = 0660/g' /etc/php-fpm.d/www.conf
-
-# Write PHP test file
-echo "Write PHP test file..."
-cat >> /usr/share/nginx/html/i.php <<EOF
-<?php
-phpinfo();
-
-EOF
-
-# Configure MariaDB
-echo "Configuring MariaDB..."
-sudo cp ./conf/my.cnf /etc/my.cnf
-sudo cp ./conf/server.cnf /etc/my.cnf.d/server.cnf
-
-echo "Configuring Firewall..."
-if [ "$CentOS_RHEL_version" == 7 ];then
-    sudo systemctl stop firewalld
-    sudo systemctl mask firewalld
-    sudo yum install iptables iptables-services -y
+if [ "$nginx_yn" == 'y' ]; then
+. ./utils/nginx.sh
 fi
 
-sudo /sbin/iptables -I INPUT -p tcp --dport 443 -j ACCEPT
-sudo /sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
-sudo /sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT
-sudo /sbin/service iptables save
-
-# Restarting Services
-echo "Restarting Services..."
-if [ "$CentOS_RHEL_version" == 6 ];then
-    sudo service iptables restart
-    sudo service mysql restart
-    sudo service php-fpm restart
-    sudo service nginx restart
-else
-    sudo systemctl start iptables
-    sudo systemctl restart mariadb.service
-    sudo systemctl restart nginx.service
-    sudo systemctl restart php-fpm.service
+if [ "$php_yn" == 'y' ]; then
+. ./utils/php.sh
 fi
 
-# Set Up Autostart
-echo "Setting Autostart..."
-if [ "$CentOS_RHEL_version" == 6 ];then
-    sudo chkconfig --levels 235 iptables on
-    sudo chkconfig --levels 235 mysql on
-    sudo chkconfig --levels 235 nginx on
-    sudo chkconfig --levels 235 php-fpm on
-else
-    sudo systemctl enable iptables.service
-    sudo systemctl enable mariadb.service
-    sudo systemctl enable nginx.service
-    sudo systemctl enable php-fpm.service
+if [ "$mariadb_yn" == 'y' ]; then
+. ./utils/mariadb.sh
 fi
-
-# Done
-echo "Configuring MariaDB..."
-sudo mysql_secure_installation <<EOF
-
-y
-${MariaDB_ROOT_PWD}
-${MariaDB_ROOT_PWD}
-y
-y
-y
-y
-EOF
diff --git a/utils/init.sh b/utils/init.sh
index d656116..7de290d 100644
--- a/utils/init.sh
+++ b/utils/init.sh
@@ -61,3 +61,14 @@ net.ipv4.tcp_mtu_probing = 1
 net.ipv4.tcp_fastopen = 3
 EOF
 sysctl -p /etc/sysctl.conf
+
+echo "Configuring Firewall..."
+sudo systemctl stop firewalld
+sudo systemctl mask firewalld
+sudo yum install iptables iptables-services -y
+
+sudo /sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT
+sudo /sbin/service iptables save
+
+sudo systemctl restart iptables
+sudo systemctl enable iptables.service