diff --git a/runtime/main/extend/systemplugin/napi/power.js b/runtime/main/extend/systemplugin/napi/power.js
index 4c3263a6..5ed1f0c8 100644
--- a/runtime/main/extend/systemplugin/napi/power.js
+++ b/runtime/main/extend/systemplugin/napi/power.js
@@ -16,7 +16,14 @@
 import { paramMock } from "../utils"
 
 export function mockPower() {
+  const DevicePowerMode = {
+    MODE_PERFORMANCE: '[PC preview] unknow MODE_PERFORMANCE',
+    MODE_NORMAL: '[PC preview] unknow MODE_NORMAL',
+    MODE_POWER_SAVE: '[PC preview] unknow MODE_POWER_SAVE',
+    MODE_EXTREME_POWER_SAVE: '[PC preview] unknow MODE_EXTREME_POWER_SAVE',
+  }
   const power = {
+    DevicePowerMode,
     shutdownDevice: function (...args) {
       console.warn("power.shutdownDevice interface mocked in the Previewer. How this interface works on the" +
         " Previewer may be different from that on a real device.")
@@ -44,7 +51,31 @@ export function mockPower() {
     suspendDevice: function (...args) {
       console.warn("power.suspendDevice interface mocked in the Previewer. How this interface works on the" +
         " Previewer may be different from that on a real device.")
-    }
+    },
+    getPowerMode: function (...args) {
+      console.warn("power.getPowerMode interface mocked in the Previewer. How this interface works on the" +
+        " Previewer may be different from that on a real device.")
+      const len = args.length
+      if (typeof args[len - 1] === 'function') {
+        args[len - 1].call(this, paramMock.businessErrorMock, DevicePowerMode);
+      } else {
+        return new Promise((resolve, reject) => {
+          resolve(DevicePowerMode);
+        })
+      }
+    },
+    setPowerMode: function (...args) {
+      console.warn("power.getPowerMode interface mocked in the Previewer. How this interface works on the" +
+        " Previewer may be different from that on a real device.")
+      const len = args.length
+      if (typeof args[len - 1] === 'function') {
+        args[len - 1].call(this, paramMock.businessErrorMock, DevicePowerMode);
+      } else {
+        return new Promise((resolve, reject) => {
+          resolve(DevicePowerMode);
+        })
+      }
+    },
   }
   return power
 }