diff --git a/build.gradle b/build.gradle
index 70c8852..a1ca85a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,9 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     repositories {
+		maven{ url 'https://maven.aliyun.com/repository/central' }
+		maven{ url 'https://maven.aliyun.com/repository/public' }
+		maven{ url 'https://maven.aliyun.com/repository/gradle-plugin'}
         google()
         mavenCentral()
         maven { url "https://jitpack.io" }
diff --git a/build.gradle.bak b/build.gradle.bak
new file mode 100644
index 0000000..70c8852
--- /dev/null
+++ b/build.gradle.bak
@@ -0,0 +1,22 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+        maven { url "https://jitpack.io" }
+        maven { url "https://www.jitpack.io" }
+        maven { url "https://jcenter.bintray.com" }
+        maven { url 'https://artifactory.mxtracks.info/artifactory/gradle-dev-local/' }
+
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.0.3'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.30'
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
\ No newline at end of file