diff --git a/runtime/main/extend/systemplugin/accessibility.js b/runtime/main/extend/systemplugin/accessibility.js
index 0efba532..cb2bbe10 100644
--- a/runtime/main/extend/systemplugin/accessibility.js
+++ b/runtime/main/extend/systemplugin/accessibility.js
@@ -16,74 +16,6 @@
 import { paramMock } from './utils';
 
 export function mockAccessibility() {
-  const AbilitySubTypeMock = {
-    UNSPECIFIED: 0,
-    CA: 1
-  };
-
-  const DisplayOrientationMock = {
-    UNSPECIFIED: 1,
-    LANDSCAPE: 2,
-    PORTRAIT: 3,
-    FOLLOWRECENT: 4
-  };
-  const LaunchModeMock = {
-    SINGLETON: 0,
-    STANDARD: 1
-  };
-
-  const ApplicationInfoMock = {
-    name: '[PC Preview] unknow name',
-    description: '[PC Preview] unknow description',
-    descriptionId: '[PC Preview] unknow descriptionId',
-    systemApp: '[PC Preview] unknow systemApp',
-    enabled: '[PC Preview] unknow enabled',
-    label: '[PC Preview] unknow label',
-    labelId: '[PC Preview] unknow labelId',
-    icon: '[PC Preview] unknow icon',
-    iconId: '[PC Preview] unknow iconId',
-    process: '[PC Preview] unknow process',
-    supportedModes: '[PC Preview] unknow supportedModes',
-    moduleSourceDirs: '[PC Preview] unknow moduleSourceDirs',
-    permissions: '[PC Preview] unknow permissions',
-    permissions: '[PC Preview] unknow permissions',
-    flags: '[PC Preview] unknow flags',
-    entryDir: '[PC Preview] unknow entryDir'
-  };
-
-  const AbilityInfoMock = {
-    bundleName: '[PC Preview] unknow bundleName',
-    name: '[PC Preview] unknow name',
-    label: '[PC Preview] unknow label',
-    description: '[PC Preview] unknow description',
-    icon: '[PC Preview] unknow icon',
-    labelId: '[PC Preview] unknow labelId',
-    descriptionId: '[PC Preview] unknow descriptionId',
-    moduleName: '[PC Preview] unknow moduleName',
-    iconId: '[PC Preview] unknow iconId',
-    process: '[PC Preview] unknow process',
-    targetAbility: '[PC Preview] unknow targetAbility',
-    backgroundModes: '[PC Preview] unknow backgroundModes',
-    isVisible: '[PC Preview] unknow isVisible',
-    formEnabled: '[PC Preview] unknow formEnabled',
-    type: AbilityTypeMock,
-    subType: AbilitySubTypeMock,
-    orientation: DisplayOrientationMock,
-    launchMode: LaunchModeMock,
-    permissions: '[PC Preview] unknow permissions',
-    deviceTypes: '[PC Preview] unknow deviceTypes',
-    deviceCapabilities: '[PC Preview] unknow deviceCapabilities',
-    readPermission: '[PC Preview] unknow readPermission',
-    writePermission: '[PC Preview] unknow writePermission',
-    applicationInfo: ApplicationInfoMock,
-    formEntity: '[PC Preview] unknow formEntity',
-    minFormHeight: '[PC Preview] unknow minFormHeight',
-    defaultFormHeight: '[PC Preview] unknow defaultFormHeight',
-    minFormWidth: '[PC Preview] unknow minFormWidth',
-    defaultFormWidth: '[PC Preview] unknow defaultFormWidth',
-    uri: '[PC Preview] unknow uri'
-  };
-
   const AbilityTypeMock = {
     audible: 'audible',
     generic: 'generic',
@@ -106,13 +38,30 @@ export function mockAccessibility() {
     id: '[PC Preview] unknow id',
     name: '[PC Preview] unknow name',
     bundleName: '[PC Preview] unknow bundleName',
-    abilityInfo: AbilityInfoMock,
     abilityTypes: [AbilityTypeMock],
     capabilities: [CapabilityMock],
     description: '[PC Preview] unknow description',
     eventTypes: [EventTypeMock]
   };
 
+  const CaptionsFontEdgeTypeMock = '[PC Preview] unknow CaptionsFontEdgeType';
+
+  const CaptionsFontFamilyMock = '[PC Preview] unknow CaptionsFontFamily';
+
+  const CaptionStyleMock = {
+    fontFamily: [CaptionsFontFamilyMock],
+    fontScale: '[PC Preview] unknow fontScale',
+    fontColor: '[PC Preview] unknow fontColor',
+    fontEdgeType: [CaptionsFontEdgeTypeMock],
+    backgroundColor: '[PC Preview] unknow backgroundColor',
+    windowColor: '[PC Preview] unknow windowColor'
+  };
+
+  const CaptionsManagerMock = {
+    enabled: '[PC Preview] unknow enabled',
+    style: [CaptionStyleMock]
+  };
+
   const WindowUpdateTypeMock = '[PC Preview] unknow WindowUpdateType';
 
   const ActionMock = '[PC Preview] unknow Action';
@@ -207,6 +156,18 @@ export function mockAccessibility() {
           resolve();
         });
       }
+    },
+    getCaptionsManager: function (...args) {
+      console.warn('accessibility.getCaptionsManager 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, [CaptionsManagerMock]);
+      } else {
+        return new Promise((resolve, reject) => {
+          resolve([CaptionsManagerMock]);
+        });
+      }
     }
   };
 }