diff --git a/CHANGELOG-2.0.md b/CHANGELOG-2.0.md
index bc65ad3ea..d2816e430 100644
--- a/CHANGELOG-2.0.md
+++ b/CHANGELOG-2.0.md
@@ -17,6 +17,7 @@
 
 - [#2951](https://github.com/hyperf/hyperf/pull/2951) Optimized code for model-cache, which will delete model cache only once, when using it in transaction.
 - [#2953](https://github.com/hyperf/hyperf/pull/2953) Hide `Swoole\ExitException` trace message in command.
+- [#2963](https://github.com/hyperf/hyperf/pull/2963) Removed `onStart` event from server default callbacks when the mode is `SWOOLE_BASE`.
 
 # v2.0.22 - 2020-12-07
 
diff --git a/src/server/src/Server.php b/src/server/src/Server.php
index e6f7561d7..43941ef06 100644
--- a/src/server/src/Server.php
+++ b/src/server/src/Server.php
@@ -209,18 +209,24 @@ class Server implements ServerInterface
 
     protected function defaultCallbacks()
     {
-        $hasCallback = class_exists(Bootstrap\StartCallback::class) &&
-            class_exists(Bootstrap\ManagerStartCallback::class) &&
-            class_exists(Bootstrap\WorkerStartCallback::class);
+        $hasCallback = class_exists(Bootstrap\StartCallback::class)
+            && class_exists(Bootstrap\ManagerStartCallback::class)
+            && class_exists(Bootstrap\WorkerStartCallback::class);
 
         if ($hasCallback) {
-            return [
-                SwooleEvent::ON_START => [Bootstrap\StartCallback::class, 'onStart'],
+            $callbacks = [
                 SwooleEvent::ON_MANAGER_START => [Bootstrap\ManagerStartCallback::class, 'onManagerStart'],
                 SwooleEvent::ON_WORKER_START => [Bootstrap\WorkerStartCallback::class, 'onWorkerStart'],
                 SwooleEvent::ON_WORKER_STOP => [Bootstrap\WorkerStopCallback::class, 'onWorkerStop'],
                 SwooleEvent::ON_WORKER_EXIT => [Bootstrap\WorkerExitCallback::class, 'onWorkerExit'],
             ];
+            if ($this->server->mode === SWOOLE_BASE) {
+                return $callbacks;
+            }
+
+            return array_merge([
+                SwooleEvent::ON_START => [Bootstrap\StartCallback::class, 'onStart'],
+            ], $callbacks);
         }
 
         return [