diff --git a/drive-gl-inet.sh b/drive-gl-inet.sh
index a89f55c..b7b5845 100644
--- a/drive-gl-inet.sh
+++ b/drive-gl-inet.sh
@@ -1,4 +1,11 @@
 #!/bin/sh
-opkg update
-opkg install bash
+check_bash_installed() {
+  if [ -x "/bin/bash" ]; then
+    echo "downloading gl-inet.sh ......"
+  else
+    opkg update
+    opkg install bash
+  fi
+}
+check_bash_installed
 wget -O /tmp/gl-inet.sh https://ghproxy.com/https://raw.githubusercontent.com/wukongdaily/gl-inet-onescript/master/gl-inet.sh && chmod +x /tmp/gl-inet.sh && /tmp/gl-inet.sh
diff --git a/prepare.sh b/prepare.sh
new file mode 100644
index 0000000..201633b
--- /dev/null
+++ b/prepare.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+# 默认情况下MT3000和MT2500A的环境是ash
+# 建议安装bash 满足更多的函数调用
+check_bash_installed() {
+  if [ -x "/bin/bash" ]; then
+    echo "downloading gl-inet.sh ......"
+  else
+    opkg update
+    opkg install bash
+  fi
+}
+check_bash_installed
\ No newline at end of file