diff --git a/libs/horizon/src/external/TestUtil.ts b/libs/horizon/src/external/TestUtil.ts
index 26d87660..dc9e3dbd 100644
--- a/libs/horizon/src/external/TestUtil.ts
+++ b/libs/horizon/src/external/TestUtil.ts
@@ -16,7 +16,7 @@
 
 import {asyncUpdates} from '../renderer/TreeBuilder';
 import {callRenderQueueImmediate} from '../renderer/taskExecutor/RenderQueue';
-import {runAsyncEffects} from '../renderer/submit/HookEffectHandler';
+import {hasAsyncEffects, runAsyncEffects} from '../renderer/submit/HookEffectHandler';
 import {isPromise} from '../renderer/ErrorHandler';
 
 interface Thenable {
@@ -62,11 +62,18 @@ function act(fun: () => void | Thenable): Thenable {
   }
 }
 
+// 防止死循环
+const LOOPING_LIMIT = 50;
+let loopingCount = 0;
 function callRenderQueue() {
   callRenderQueueImmediate();
-  runAsyncEffects();
-  // effects可能产生刷新任务，这里再执行一次
-  callRenderQueueImmediate();
+
+  while (hasAsyncEffects() && loopingCount < LOOPING_LIMIT) {
+    loopingCount++;
+    runAsyncEffects();
+    // effects可能产生刷新任务，这里再执行一次
+    callRenderQueueImmediate();
+  }
 }
 
 export {
diff --git a/libs/horizon/src/renderer/submit/HookEffectHandler.ts b/libs/horizon/src/renderer/submit/HookEffectHandler.ts
index 140eceef..c7db9c32 100644
--- a/libs/horizon/src/renderer/submit/HookEffectHandler.ts
+++ b/libs/horizon/src/renderer/submit/HookEffectHandler.ts
@@ -25,6 +25,11 @@ import { EffectConstant } from '../hooks/EffectConstant';
 
 let hookEffects: Array<HookEffect | VNode> = [];
 let hookRemoveEffects: Array<HookEffect | VNode> = [];
+
+export function hasAsyncEffects() {
+  return hookEffects.length > 0 || hookRemoveEffects.length > 0;
+}
+
 // 是否正在异步调度effects
 let isScheduling = false;
 
diff --git a/scripts/__tests__/ActTest/act.test.js b/scripts/__tests__/ActTest/act.test.js
new file mode 100644
index 00000000..3ee055df
--- /dev/null
+++ b/scripts/__tests__/ActTest/act.test.js
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2020 Huawei Technologies Co.,Ltd.
+ *
+ * openGauss is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *
+ *          http://license.coscl.org.cn/MulanPSL2
+ *
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+import Horizon, { render, useState, act, useEffect } from '@cloudsop/horizon/index.ts';
+
+describe('Horizon.act function Test', () => {
+  it('Parent can get Child instance by refs', function () {
+    const Parent = props => {
+      const [buttonOptions, setBtn] = useState([]);
+      const [checkedRows, setCheckedRows] = useState([]);
+
+      useEffect(() => {
+        setBtn([1, 2, 3]);
+      }, [checkedRows.length]);
+
+      return (
+        <div>
+          <Child buttonOptions={buttonOptions}></Child>
+        </div>
+      );
+    };
+
+    const Child = props => {
+      const { buttonOptions } = props;
+      const [btnList, setBtnList] = useState(0);
+
+      useEffect(() => {
+        setBtnList(buttonOptions.length);
+      }, [buttonOptions]);
+
+      return <div id="childDiv">{btnList}</div>;
+    };
+
+    act(() => {
+      render(<Parent />, container);
+    });
+
+    // act能够等待useEffect触发的update完成
+    expect(container.querySelector('#childDiv').innerHTML).toEqual('3');
+  });
+});
diff --git a/scripts/__tests__/ComponentTest/ClassRefs.test.js b/scripts/__tests__/ComponentTest/ClassRefs.test.js
new file mode 100644
index 00000000..d5e91d29
--- /dev/null
+++ b/scripts/__tests__/ComponentTest/ClassRefs.test.js
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2020 Huawei Technologies Co.,Ltd.
+ *
+ * openGauss is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *
+ *          http://license.coscl.org.cn/MulanPSL2
+ *
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+import * as Horizon from '@cloudsop/horizon/index.ts';
+
+describe('Class refs Test', () => {
+  it('Parent can get Child instance by refs', function () {
+    let pInst;
+
+    class Parent extends Horizon.Component {
+      componentDidMount() {
+        pInst = this;
+      }
+
+      render() {
+        return (
+          <div>
+            <Child ref="child">
+              <div ref="childDiv">childDiv</div>
+            </Child>
+          </div>
+        );
+      }
+    }
+
+    class Child extends Horizon.Component {
+      state = { y: 0 };
+
+      render() {
+        return <div>{this.props.children}</div>;
+      }
+    }
+
+    Horizon.render(<Parent />, container);
+
+    expect(pInst.refs['child'].state.y).toEqual(0);
+    expect(pInst.refs['childDiv'].innerHTML).toEqual('childDiv');
+  });
+});