diff --git a/Dockerfile b/Dockerfile
index 9e469220..1863705d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,7 @@
 FROM golang:1.17.5 AS BACK
 WORKDIR /go/src/casdoor
 COPY . .
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOPROXY=https://goproxy.cn,direct go build -ldflags="-w -s" -o server . \
-    && apt update && apt install wait-for-it && chmod +x /usr/bin/wait-for-it
+RUN ./build.sh && apt update && apt install wait-for-it && chmod +x /usr/bin/wait-for-it
 
 FROM node:16.13.0 AS FRONT
 WORKDIR /web
diff --git a/build.sh b/build.sh
new file mode 100755
index 00000000..f960167c
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+#try to connect to google to determine whether user need to use proxy
+curl www.google.com -o /dev/null --connect-timeout 5
+if [ $? == 0 ]
+then
+    echo "connect to google.com successed"
+    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o server .
+else
+    echo "connect to google.com failed"
+    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOPROXY=https://goproxy.cn,direct go build -ldflags="-w -s" -o server .
+fi
\ No newline at end of file