diff --git a/.github/workflows/PR_check.yml b/.github/workflows/PR_check.yml
new file mode 100644
index 0000000..0b1b034
--- /dev/null
+++ b/.github/workflows/PR_check.yml
@@ -0,0 +1,49 @@
+on: pull_request
+
+jobs:
+  build:
+    name: Build on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest ]
+    if: ${{ !startsWith(github.event.head_commit.message, 'docs:') }}
+
+    steps:
+      - name: Check out
+        uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+          fetch-depth: 0
+
+      - name: Gradle wrapper validation
+        uses: gradle/wrapper-validation-action@v1
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: '11'
+
+      - name: Creat key
+        run: |
+          PASSWD=$(echo $RANDOM | md5sum | head -c 15)
+          keytool -genkey -noprompt -v -keystore android.keystore -alias PRCHECKSIGN -keyalg RSA -keysize 2048 -validity 10000 -keypass ${PASSWD} -storepass ${PASSWD} -dname "CN=xx, OU=xx, O=xx, L=xx, S=xx, C=xx" 
+          echo storePassword="${PASSWD}" >> local.properties
+          echo keyAlias="PRCHECKSIGN" >> local.properties
+          echo keyPassword="${PASSWD}" >> local.properties
+          echo fileDir='../android.keystore' >> local.properties
+
+      - name: Make gradlew executable
+        run: chmod +x ./gradlew
+
+      - name: Gradle prebuild
+        run: ./gradlew prebuild
+
+      - name: Build Release
+        id: buildRelease
+        run: |
+          ./gradlew :app:assembleRelease
+          echo "::set-output name=releaseName::`ls app/build/outputs/apk/release/V*-release.apk | awk -F '(/|.apk)' '{print $6}'`"
+
+
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 5b4ac60..d6bf55a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -1,8 +1,6 @@
 on:
   push:
     branches: [ master ]
-  pull_request:
-    branches: [ master ]
 
 jobs:
   build: