diff --git a/package.json b/package.json
index 20e60cb617..f7fac2f97a 100644
--- a/package.json
+++ b/package.json
@@ -99,7 +99,7 @@
     "screenshot": "node ./bin/screenshot.js",
     "start": "npm run dev",
     "test": "torch --compile --renderer --recursive ./test/unit",
-    "test-live": "torch --compile --interactive --watch --recursive ./test/unit/plugins/tool.textDisplay-spec.js",
+    "test-live": "torch --compile --interactive --watch --recursive ./test/unit/",
     "watch": "webpack --config webpack-dev.config.js",
     "win-dev": "node ./bin/win-dev.js"
   },
diff --git a/src/extend/g/group.js b/src/extend/g/group.js
index 3b69b52834..a926b0e301 100755
--- a/src/extend/g/group.js
+++ b/src/extend/g/group.js
@@ -61,6 +61,19 @@ Util.augment(Mixin, {
   sortBy(callback) {
     const children = this.get('children');
     this.set('children', Util.radixSort(children, callback));
+  },
+  /**
+   * clear inner elements
+   * @param  {boolean} bool if destroy child
+   * @return {object}  this
+   */
+  clear(bool) {
+    const children = this._cfg.children;
+    for (let i = children.length - 1; i >= 0; i--) {
+      children[i].remove(bool);
+    }
+    this._cfg.children = [];
+    return this;
   }
 });