diff --git a/libs/horizon/src/renderer/taskExecutor/BrowserAsync.ts b/libs/horizon/src/renderer/taskExecutor/BrowserAsync.ts
index 28e17a84..2aeead9f 100644
--- a/libs/horizon/src/renderer/taskExecutor/BrowserAsync.ts
+++ b/libs/horizon/src/renderer/taskExecutor/BrowserAsync.ts
@@ -19,11 +19,9 @@
 
 let isMessageLoopRunning = false;
 let browserCallback = null;
-const { port1, port2 } = new MessageChannel();
-
-export function isOverTime() {
-  return false;
-}
+let port1 = null;
+let port2 = null;
+let isTestRuntime = false;
 
 // 1、设置deadline；2、回调TaskExecutor传过来的browserCallback
 const callRenderTasks = () => {
@@ -41,21 +39,38 @@ const callRenderTasks = () => {
       browserCallback = null;
     } else {
       // 还有task，继续调用
-      port2.postMessage(null);
+      asyncCall();
     }
   } catch (error) {
-    port2.postMessage(null);
+    asyncCall();
     throw error;
   }
 };
 
-port1.onmessage = callRenderTasks;
+if (typeof MessageChannel === 'function') {
+  const mc = new MessageChannel();
+  port1 = mc.port1;
+  port1.onmessage = callRenderTasks;
+  port2 = mc.port2;
+} else {
+  // 测试环境没有 MessageChannel
+  isTestRuntime = true;
+}
+
+function asyncCall() {
+  if (isTestRuntime) {
+    setTimeout(callRenderTasks, 0);
+  } else {
+    port2.postMessage(null);
+  }
+}
 
 export function requestBrowserCallback(callback) {
   browserCallback = callback;
 
   if (!isMessageLoopRunning) {
     isMessageLoopRunning = true;
-    port2.postMessage(null);
+    asyncCall();
   }
 }
+
diff --git a/libs/horizon/src/renderer/taskExecutor/TaskExecutor.ts b/libs/horizon/src/renderer/taskExecutor/TaskExecutor.ts
index 8613cfca..ac5ce9b3 100644
--- a/libs/horizon/src/renderer/taskExecutor/TaskExecutor.ts
+++ b/libs/horizon/src/renderer/taskExecutor/TaskExecutor.ts
@@ -18,7 +18,7 @@
  */
 
 import { Node } from '../taskExecutor/TaskQueue';
-import { requestBrowserCallback, isOverTime } from './BrowserAsync';
+import { requestBrowserCallback } from './BrowserAsync';
 
 import { add, shift, first, remove } from './TaskQueue';
 
@@ -44,11 +44,6 @@ function callTasks() {
 
     // 循环执行task
     while (task !== null) {
-      if (isOverTime()) {
-        // 超过了deadline
-        break;
-      }
-
       const callback = task.callback;
       if (callback !== null) {
         task.callback = null;