diff --git a/core/build.gradle b/core/build.gradle
index 14541e0e..1317d12e 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -37,6 +37,18 @@ task goBuild(type: Exec) {
     args "-c", "src/overture/make.bash " + minSdkVersion
 }
 
+task goClean(type: Exec) {
+    executable "sh"
+    args "-c", "src/overture/clean.bash"
+}
+
+tasks.whenTaskAdded { task ->
+  if (task.name == 'externalNativeBuildDebug' ||
+          task.name == 'externalNativeBuildRelease') {
+      task.dependsOn(goBuild)
+    }
+}
+
 dependencies {
     api project(':plugin')
     testImplementation "junit:junit:$junitVersion"
diff --git a/core/src/overture/clean.bash b/core/src/overture/clean.bash
new file mode 100755
index 00000000..b75dc943
--- /dev/null
+++ b/core/src/overture/clean.bash
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+TARGET=$DIR/../main/jni/overture
+DEPS=$DIR/.deps
+
+rm -rf $DEPS
+rm -rf $DIR/go/bin
+rm -rf $DIR/bin
+rm -rf $TARGET
+
+echo "Successfully clean overture"
diff --git a/core/src/overture/make.bash b/core/src/overture/make.bash
index 6c812f81..7310a61a 100755
--- a/core/src/overture/make.bash
+++ b/core/src/overture/make.bash
@@ -63,19 +63,25 @@ pushd $GOPATH/src/github.com/shadowsocks/overture/main
 godep restore
 
 echo "Cross compile overture for arm"
-try env CGO_ENABLED=1 CC=$ANDROID_ARM_CC GOOS=android GOARCH=arm GOARM=7 go build -ldflags="-s -w"
-try $ANDROID_ARM_STRIP main
-try mv main $TARGET/armeabi-v7a/liboverture.so
+if [ ! -f "$TARGET/armeabi-v7a/liboverture.so" ]; then
+    try env CGO_ENABLED=1 CC=$ANDROID_ARM_CC GOOS=android GOARCH=arm GOARM=7 go build -ldflags="-s -w"
+    try $ANDROID_ARM_STRIP main
+    try mv main $TARGET/armeabi-v7a/liboverture.so
+fi
 
 echo "Cross compile overture for arm64"
-try env CGO_ENABLED=1 CC=$ANDROID_ARM64_CC GOOS=android GOARCH=arm64 go build -ldflags="-s -w"
-try $ANDROID_ARM64_STRIP main
-try mv main $TARGET/arm64-v8a/liboverture.so
+if [ ! -f "$TARGET/arm64-v8a/liboverture.so" ]; then
+    try env CGO_ENABLED=1 CC=$ANDROID_ARM64_CC GOOS=android GOARCH=arm64 go build -ldflags="-s -w"
+    try $ANDROID_ARM64_STRIP main
+    try mv main $TARGET/arm64-v8a/liboverture.so
+fi
 
 echo "Cross compile overture for x86"
-try env CGO_ENABLED=1 CC=$ANDROID_X86_CC GOOS=android GOARCH=386 go build -ldflags="-s -w"
-try $ANDROID_X86_STRIP main
-try mv main $TARGET/x86/liboverture.so
+if [ ! -f "$TARGET/x86/liboverture.so" ]; then
+    try env CGO_ENABLED=1 CC=$ANDROID_X86_CC GOOS=android GOARCH=386 go build -ldflags="-s -w"
+    try $ANDROID_X86_STRIP main
+    try mv main $TARGET/x86/liboverture.so
+fi
 
 popd