diff --git a/bundle.json b/bundle.json
index 78b145b37c41506c2958d7904c596617eca78693..ded14f6a75e1871877a533a53154379aa192f90d 100644
--- a/bundle.json
+++ b/bundle.json
@@ -19,7 +19,9 @@
         "SystemCapability.FileManagement.File.DistributedFile",
         "SystemCapability.FileManagement.File.Environment.FolderObtain"
       ],
-      "features": [],
+      "features": [
+        "file_api_read_optimize"
+      ],
       "adapted_system_type": [ "mini","small","standard" ],
       "rom": "4096KB",
       "ram": "4096KB",
diff --git a/file_api.gni b/file_api.gni
index 7fc94ace62004264471a75000deb0900070d3727..16a2906232aa9e6c0be06d10d274a6f673b32e2e 100644
--- a/file_api.gni
+++ b/file_api.gni
@@ -23,3 +23,7 @@ utils_path = "${file_api_path}/utils"
 use_mac = "${current_os}_${current_cpu}" == "mac_x64" ||
           "${current_os}_${current_cpu}" == "mac_arm64"
 use_mingw_win = "${current_os}_${current_cpu}" == "mingw_x86_64"
+
+declare_args() {
+    file_api_read_optimize = false
+}
diff --git a/interfaces/kits/js/BUILD.gn b/interfaces/kits/js/BUILD.gn
index e06a5ceced045c0612723daad369a7875dd74312..9fc445f9ab59139dfe499b9fb3c1c33d8d637021 100644
--- a/interfaces/kits/js/BUILD.gn
+++ b/interfaces/kits/js/BUILD.gn
@@ -377,6 +377,10 @@ ohos_shared_library("file") {
     "hilog:libhilog",
     "napi:ace_napi",
   ]
+
+  if (file_api_read_optimize) {
+    defines = [ "WEARABLE_PRODUCT" ]
+  }
 }
 
 ohos_shared_library("statfs") {
diff --git a/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.cpp b/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.cpp
index 972c56b50e24e06c9da0c230609323ca6dfcc464..01f591e74928233f30d421f2474786e3aa46a53b 100644
--- a/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.cpp
+++ b/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.cpp
@@ -905,7 +905,11 @@ void ReadArrayBufferExec(napi_env env, void *data)
             if (read(fdg.GetFD(), buffer.get(), len) != FAILED) {
                 asyncCallbackInfo->result = SUCCESS;
                 asyncCallbackInfo->len = len;
+#ifdef WEARABLE_PRODUCT
+                asyncCallbackInfo->contents = std::move(buffer);
+#else
                 asyncCallbackInfo->contents = std::string(buffer.get());
+#endif
             }
         }
     } else if (statPath == ENOENT) {
diff --git a/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.h b/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.h
index b9760b8a5c75ee115c0bc81e3f16e46339401a74..f39a8069ea84c2e58d15649705fd7fe6fd626a51 100644
--- a/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.h
+++ b/interfaces/kits/js/src/mod_file/class_file/file_n_exporter.h
@@ -172,7 +172,11 @@ struct AsyncReadBufferCallbackInfo {
     int result = DEFAULT_RESULT;
     int errorType = -1;
     int32_t len = 0;
+#ifdef WEARABLE_PRODUCT
+    std::unique_ptr<char[]> contents = nullptr;
+#else
     std::string contents = "";
+#endif
 };
 
 class FileNExporter final : public NExporter {