diff --git a/packages/runtime/src/components/core/Watcher.ts b/packages/runtime/src/components/core/Watcher.ts
new file mode 100644
index 000000000..91f5ae6bf
--- /dev/null
+++ b/packages/runtime/src/components/core/Watcher.ts
@@ -0,0 +1,52 @@
+import { Type } from '@sinclair/typebox';
+import {
+  CORE_VERSION_V2,
+  CoreComponentName,
+  PRESET_PROPERTY_CATEGORY,
+} from '@sunmao-ui/shared';
+import { implementRuntimeComponent } from '../../utils/buildKit';
+import { useEffect } from 'react';
+import { watch } from '../..';
+
+export default implementRuntimeComponent({
+  version: CORE_VERSION_V2,
+  metadata: {
+    name: CoreComponentName.Watcher,
+    displayName: 'Watcher',
+    description: 'Watch expression changing and trigger events',
+    exampleProperties: { exp: '' },
+    isDataSource: true,
+    annotations: {
+      category: 'Data',
+    },
+  },
+  spec: {
+    properties: Type.Object({
+      exp: Type.String({
+        title: 'Expression',
+        category: PRESET_PROPERTY_CATEGORY.Basic,
+      }),
+    }),
+    state: Type.Object({ value: Type.Any() }),
+    methods: {},
+    slots: {},
+    styleSlots: [],
+    events: ['onChange'],
+  },
+})(({ component, services, mergeState, callbackMap }) => {
+  useEffect(() => {
+    const stop = watch(
+      () => {
+        const v = services.stateManager.deepEval(component.properties.exp, {});
+        return v;
+      },
+      newV => {
+        mergeState({ value: newV });
+        callbackMap?.onChange();
+      }
+    );
+
+    return stop;
+  }, [callbackMap, component.properties.exp, mergeState, services.stateManager]);
+  return null;
+});
diff --git a/packages/runtime/src/services/Registry.tsx b/packages/runtime/src/services/Registry.tsx
index 5491eb597..728d781fb 100644
--- a/packages/runtime/src/services/Registry.tsx
+++ b/packages/runtime/src/services/Registry.tsx
@@ -11,6 +11,7 @@ import CoreStack from '../components/core/Stack';
 import CoreFileInput from '../components/core/FileInput';
 import CoreList from '../components/core/List';
 import CoreIframe from '../components/core/Iframe';
+import CoreWatcher from '../components/core/Watcher';
 
 // traits
 import CoreArrayState from '../traits/core/ArrayState';
@@ -257,6 +258,7 @@ export function initRegistry(
   registry.registerComponent(CoreFileInput);
   registry.registerComponent(CoreList);
   registry.registerComponent(CoreIframe);
+  registry.registerComponent(CoreWatcher);
 
   registry.registerTrait(CoreState);
   registry.registerTrait(CoreArrayState);
diff --git a/packages/shared/src/constants/core.ts b/packages/shared/src/constants/core.ts
index 1e8ef397d..b33c9a954 100644
--- a/packages/shared/src/constants/core.ts
+++ b/packages/shared/src/constants/core.ts
@@ -7,6 +7,7 @@ export enum CoreComponentName {
   ModuleContainer = 'moduleContainer',
   Text = 'text',
   Iframe = 'iframe',
+  Watcher = 'watcher',
 }
 // core traits
 export enum CoreTraitName {