diff --git a/x-ui.sh b/x-ui.sh
index 03432c31..0ae5e2dd 100644
--- a/x-ui.sh
+++ b/x-ui.sh
@@ -20,46 +20,41 @@ function LOGI() {
 # check root
 [[ $EUID -ne 0 ]] && LOGE "ERROR: You must be root to run this script! \n" && exit 1
 
-# check os
-if [[ -f /etc/redhat-release ]]; then
-    release="centos"
-elif cat /etc/issue | grep -Eqi "debian"; then
-    release="debian"
-elif cat /etc/issue | grep -Eqi "ubuntu"; then
-    release="ubuntu"
-elif cat /etc/issue | grep -Eqi "centos|red hat|redhat"; then
-    release="centos"
-elif cat /proc/version | grep -Eqi "debian"; then
-    release="debian"
-elif cat /proc/version | grep -Eqi "ubuntu"; then
-    release="ubuntu"
-elif cat /proc/version | grep -Eqi "centos|red hat|redhat"; then
-    release="centos"
+# Check OS and set release variable
+if [[ -f /etc/os-release ]]; then
+    source /etc/os-release
+    release=$ID
+elif [[ -f /usr/lib/os-release ]]; then
+    source /usr/lib/os-release
+    release=$ID
 else
-    LOGE "check system OS failed,please contact with author! \n" && exit 1
+    echo "Failed to check the system OS, please contact the author!" >&2
+    exit 1
 fi
 
+echo "The OS release is: $release"
+
+
 os_version=""
+os_version=$(grep -i version_id /etc/os-release | cut -d \" -f2 | cut -d . -f1)
 
-# os version
-if [[ -f /etc/os-release ]]; then
-    os_version=$(awk -F'[= ."]' '/VERSION_ID/{print $3}' /etc/os-release)
-fi
-if [[ -z "$os_version" && -f /etc/lsb-release ]]; then
-    os_version=$(awk -F'[= ."]+' '/DISTRIB_RELEASE/{print $2}' /etc/lsb-release)
-fi
-
-if [[ x"${release}" == x"centos" ]]; then
-    if [[ ${os_version} -le 6 ]]; then
-        LOGE "please use CentOS 7 or higher version! \n" && exit 1
-    fi
-elif [[ x"${release}" == x"ubuntu" ]]; then
-    if [[ ${os_version} -lt 16 ]]; then
-        LOGE "please use Ubuntu 16 or higher version！\n" && exit 1
-    fi
-elif [[ x"${release}" == x"debian" ]]; then
+if [[ "${release}" == "centos" ]]; then
     if [[ ${os_version} -lt 8 ]]; then
-        LOGE "please use Debian 8 or higher version！\n" && exit 1
+        echo -e "${red} Please use CentOS 8 or higher ${plain}\n" && exit 1
+    fi
+elif [[ "${release}" ==  "ubuntu" ]]; then
+    if [[ ${os_version} -lt 20 ]]; then
+        echo -e "${red}please use Ubuntu 20 or higher version！${plain}\n" && exit 1
+    fi
+
+elif [[ "${release}" == "fedora" ]]; then
+    if [[ ${os_version} -lt 36 ]]; then
+        echo -e "${red}please use Fedora 36 or higher version！${plain}\n" && exit 1
+    fi
+
+elif [[ "${release}" == "debian" ]]; then
+    if [[ ${os_version} -lt 10 ]]; then
+        echo -e "${red} Please use Debian 10 or higher ${plain}\n" && exit 1
     fi
 fi