diff --git a/install.sh b/install.sh
index ef8ba01..c175ba2 100755
--- a/install.sh
+++ b/install.sh
@@ -10,12 +10,13 @@ welcome () {
     echo ""
 }
 
-# 检测mac mini的cpu芯片
+# 获取mac mini的cpu芯片型号信息
 getCpuInfo () {
     cpu_info=`sysctl -n machdep.cpu.brand_string`
     echo "你的电脑芯片型号：${cpu_info}"
 }
 
+# 获取电脑cpu类型
 # 返回值：1 = intel芯片，2 = 苹果芯片
 getCpuType () {
     cpu_info=`sysctl -n machdep.cpu.brand_string`
@@ -27,6 +28,29 @@ getCpuType () {
     return 2    #默认为苹果芯片
 }
 
+# 检测是否已经安装了docker
+# 返回值：0 - 未安装，1 - 已安装
+detectDockerInstalled () {
+    if [ command -v docker > /dev/null ]; then
+        return 1
+    fi
+
+    return 0
+}
+
+# 检测docker desktop是否启动
+# 返回值：0 - 未启动，1 - 已启动
+detectDockerStarted () {
+    res=`docker images | grep -v grep | grep "IMAGE ID" | wc -l`
+    if [ $res -gt 0 ]; then
+        return 1
+    fi
+
+    return 0
+}
+
+# 检测域名是否能连接
+# 返回值：0 - 不能连接，1 - 可连接
 detectDomainCanConnect () {
     domain=$1
     if [ -z "${domain}" ]; then
@@ -36,13 +60,14 @@ detectDomainCanConnect () {
 
     ping_res=`ping -c 3 "${domain}"`
     if [[ $ping_res == *"100.0% packet loss"* ]]; then
-    	return 0
+        return 0
     fi
 
     return 1
 }
 
-#参数：connect_res，可选值：[0, 1]
+# 获取docker desktop下载地址
+# 参数：connect_res，可选值：[0, 1]
 getDockerDesktopDownloadUrl () {
     getCpuType
     cup_type=$?
@@ -57,13 +82,14 @@ getDockerDesktopDownloadUrl () {
 
     connect_res=$1
     if [ $connect_res -eq 0 ]; then
-	    echo "${dmgLink}"
+        echo "${dmgLink}"
     else
         #原网址
-    	echo "${dmgLink_docker}"
+        echo "${dmgLink_docker}"
     fi
 }
 
+# 下载docker desktop
 downloadDockerDesktop () {
     link=$1
     if [ -z "${link}" ]; then
@@ -75,20 +101,54 @@ downloadDockerDesktop () {
     echo "即将在浏览器中打开docker desktop的下载链接并开始下载"
     echo "请在docker desktop下载完成后，双击打开安装"
     open "${link}"
-
-    echo "如果你已经安装完成，请按Y继续安装machete镜像"
-    read -p "docker desktop已安装，继续？(Y/N): " confirm && [[ $confirm == [yY] || $confirm == [yY][eE][sS] ]] || exit 1
-    echo "正在为你安装machete镜像..."
 }
 
 
 # 安装docker desktop和machete
 welcome
-getCpuInfo
-getCpuType
-detect_domain='https://desktop.docker.com'
-echo "正在检测是否能连接[${detect_domain}]，请稍后..."
-detectDomainCanConnect "${detect_domain}"
-connect_res=$?
-link=`getDockerDesktopDownloadUrl $connect_res`
-downloadDockerDesktop "${link}"
+
+detectDockerInstalled
+docker_installed=$?
+
+if [ $docker_installed -eq 0 ]; then
+    getCpuInfo
+    getCpuType
+    detect_domain='https://desktop.docker.com'
+    echo "正在检测是否能连接[${detect_domain}]，请稍后..."
+    detectDomainCanConnect "${detect_domain}"
+    connect_res=$?
+    if [ $connect_res -eq 0 ]; then
+        echo "⚠️⚠️"
+        echo "当前网络无法连接[${detect_domain}]，即将从备用网址下载docker desktop，预计耗时 30 分钟"
+        echo "如果你已经下载过docker desktop，请复制到当前电脑直接安装"
+        read -p "确认继续下载？(Y/N): " confirm
+        if [[ $confirm == [yY] || $confirm == [yY][eE][sS] ]]; then
+            link=`getDockerDesktopDownloadUrl $connect_res`
+            downloadDockerDesktop "${link}"
+        fi
+    fi
+
+    echo "如果你已经安装完成，请按Y继续安装machete镜像"
+    read -p "docker desktop已安装，继续？(Y/N): " confirm && [[ $confirm == [yY] || $confirm == [yY][eE][sS] ]] || exit 1
+
+    detectDockerInstalled
+    docker_installed=$?
+    if [ $docker_installed -eq 0 ]; then
+        echo "⚠️⚠️⚠️"
+        echo "命令行检测不到docker，请确认docker desktop已经安装"
+        echo "如果docker desktop已经安装，请关闭当前termina窗口重新打开命令行终端窗口，重新执行此安装脚本"
+        exit 1
+    fi
+fi
+
+detectDockerStarted
+docker_started=$?
+if [ $docker_started -eq 0 ]; then
+    echo "⚠️⚠️"
+    echo "请双击docker图标启动docker desktop，再继续下一步"
+    read -p "已经启动docker desktop，继续安装？(Y/N): " confirm && [[ $confirm == [yY] || $confirm == [yY][eE][sS] ]] || exit 1
+fi
+
+echo ""
+echo "正在为你安装machete镜像..."
+echo ""