diff --git a/ohos/src/main/ets/components/FlutterBoost.ets b/ohos/src/main/ets/components/FlutterBoost.ets
index 7d8114d2f..93c33d13a 100644
--- a/ohos/src/main/ets/components/FlutterBoost.ets
+++ b/ohos/src/main/ets/components/FlutterBoost.ets
@@ -145,6 +145,17 @@ export class FlutterBoost {
     });
   }
 
+  public async unsetFlutterBoost() {
+    this.plugin?.setDelegate(null);
+    this.plugin = null;
+    this.delegate = null;
+
+    FlutterEngineCache.getInstance().remove(FlutterBoost.ENGINE_ID);
+    // 暂时不调用，会crash
+    // this.flutterEngine?.destroy();
+    this.flutterEngine = null;
+  }
+
   /**
    * 打开页面
    * @param pageName 页面名称
@@ -226,4 +237,4 @@ export class FlutterBoost {
   public isTopContainer(container: FlutterViewContainer): boolean {
     return FlutterContainerManager.getInstance().getTopContainer() == container;
   }
-}
\ No newline at end of file
+}
diff --git a/ohos/src/main/ets/components/plugin/FlutterBoostPlugin.ets b/ohos/src/main/ets/components/plugin/FlutterBoostPlugin.ets
index 00a07ab57..ab346c708 100644
--- a/ohos/src/main/ets/components/plugin/FlutterBoostPlugin.ets
+++ b/ohos/src/main/ets/components/plugin/FlutterBoostPlugin.ets
@@ -203,7 +203,7 @@ export class FlutterBoostPlugin implements FlutterPlugin, MethodCallHandler, Nat
   }
 
   // public method
-  public setDelegate(delegate: FlutterBoostDelegate) {
+  public setDelegate(delegate: FlutterBoostDelegate | null) {
     this.delegate = delegate;
   }
 
@@ -485,4 +485,4 @@ export class FlutterBoostPlugin implements FlutterPlugin, MethodCallHandler, Nat
     }
     return value;
   }
-}
\ No newline at end of file
+}