diff --git a/runtime/main/extend/systemplugin/napi/filemanager.js b/runtime/main/extend/systemplugin/napi/filemanager.js
new file mode 100644
index 0000000000000000000000000000000000000000..27b6174f2097c2fe6d5375f901707c50e24ab261
--- /dev/null
+++ b/runtime/main/extend/systemplugin/napi/filemanager.js
@@ -0,0 +1,43 @@
+import { paramMock } from "../utils"
+
+export function mockFileManager() {
+  const filemanager = {
+    getRoot: function (...args) {
+      console.warn("filemanager.getRoot 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, paramMock.paramArrayMock)
+      } else {
+        return new Promise((resolve, reject) => {
+          resolve(paramMock.paramArrayMock);
+        })
+      }
+    },
+    listFile: function (...args) {
+      console.warn("filemanager.listFile 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, paramMock.paramArrayMock)
+      } else {
+        return new Promise((resolve, reject) => {
+          resolve(paramMock.paramArrayMock);
+        })
+      }
+    },
+    createFile: function (...args) {
+      console.warn("filemanager.createFile 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, paramMock.paramStringMock)
+      } else {
+        return new Promise((resolve, reject) => {
+          resolve(paramMock.paramStringMock);
+        })
+      }
+    },
+  }
+  return filemanager;
+}
diff --git a/runtime/main/extend/systemplugin/napi/index.js b/runtime/main/extend/systemplugin/napi/index.js
index c7a588b2743bdf0c95d2ed5b2cc862fb46af5aab..eacdef4a8bc97b5245e4cc2d0c90bbf24c661c52 100644
--- a/runtime/main/extend/systemplugin/napi/index.js
+++ b/runtime/main/extend/systemplugin/napi/index.js
@@ -35,6 +35,7 @@ import { mockSettings } from './settings'
 import { mockUri } from './uri'
 import { mockXml } from './xml'
 import { mockStatfs } from './statfs'
+import { mockFileManager } from "./filemanager"
 
 export function mockRequireNapiFun() {
   global.requireNapi = function (...args) {
@@ -113,6 +114,8 @@ export function mockRequireNapiFun() {
         return mockXml();
       case "statfs":
         return mockStatfs();
+      case "filemanager":
+        return mockFileManager();
       default:
         return global.requireNapiPreview(...args);
     }