diff --git a/js_util_module/util/js_textencoder.cpp b/js_util_module/util/js_textencoder.cpp
index 1b0e5f7555fcb733141f1d2b19c684f409d34015..b5c4ed42c4c6b93da444edd87d11d567a76bb101 100644
--- a/js_util_module/util/js_textencoder.cpp
+++ b/js_util_module/util/js_textencoder.cpp
@@ -25,7 +25,7 @@ namespace OHOS::Util {
     napi_value TextEncoder::GetEncoding(napi_env env) const
     {
         napi_value result = nullptr;
-        NAPI_CALL(env, napi_create_string_utf8(env, encoding_.c_str(), encoding_.length(), &result));
+        NAPI_CALL(env, napi_create_string_utf8(env, orgEncoding_.c_str(), orgEncoding_.length(), &result));
 
         return result;
     }
@@ -37,7 +37,7 @@ namespace OHOS::Util {
         size_t outLens = 0;
         void *data = nullptr;
         napi_value arrayBuffer = nullptr;
-        if (encoding_ == "utf-8" || encoding_ == "UTF-8") {
+        if (encoding_ == "utf-8") {
             size_t bufferSize = 0;
             if (napi_get_value_string_utf8(env, src, nullptr, 0, &bufferSize) != napi_ok) {
                 HILOG_ERROR("textencoder::can not get src size");
diff --git a/js_util_module/util/js_textencoder.h b/js_util_module/util/js_textencoder.h
index 85635d52b1e89f0b09d1838ffe9f94367e4c3bf7..d3b7967952d520c616bbef09d7e67911624d66ba 100644
--- a/js_util_module/util/js_textencoder.h
+++ b/js_util_module/util/js_textencoder.h
@@ -20,9 +20,12 @@
 
 #include "napi/native_api.h"
 #include "napi/native_node_api.h"
+#include "native_engine.h"
 #include "unicode/ucnv.h"
 
 namespace OHOS::Util {
+    constexpr const int32_t API_VERSION_MOD = 100; // 100: api version mod
+    constexpr const int32_t API13 = 13; // 13: api version
     class TextEncoder {
     public:
         /**
@@ -61,8 +64,27 @@ namespace OHOS::Util {
          */
         napi_value EncodeInto(napi_env env, napi_value src, napi_value dest) const;
 
+        void SetOrgEncoding(std::string orgEncoding)
+        {
+            orgEncoding_ = orgEncoding;
+        }
+
+        void SetApiIsolated(napi_env env)
+        {
+            if (encoding_ != "utf-16be" && encoding_ != "utf-16le") {
+                return;
+            }
+            NativeEngine* engine = reinterpret_cast<NativeEngine*>(env);
+            if (engine != nullptr) {
+                int32_t currentApi = engine->GetApiVersion() % API_VERSION_MOD;
+                if (currentApi >= API13) {
+                    encoding_ = encoding_ == "utf-16be" ? "utf-16le" : "utf-16be";
+                }
+            }
+        }
     private:
         std::string encoding_ {};
+        std::string orgEncoding_ {};
     };
 }
 #endif // UTIL_JS_TEXTENCODER_H
diff --git a/js_util_module/util/native_module_util.cpp b/js_util_module/util/native_module_util.cpp
index fcf211471cd17ff8ee1568268288a3efc2dac52f..cb873cb0b5c82e10fc1ba2f9cc2ed75da528af14 100644
--- a/js_util_module/util/native_module_util.cpp
+++ b/js_util_module/util/native_module_util.cpp
@@ -592,7 +592,8 @@ namespace OHOS::Util {
         napi_value thisVar = nullptr;
         napi_value src = nullptr;
         napi_get_cb_info(env, info, &argc, &src, &thisVar, nullptr);
-        std::string enconding = "utf-8";
+        std::string encoding = "utf-8";
+        std::string orgEncoding = encoding;
         if (argc == 1) {
             napi_get_cb_info(env, info, &argc, &src, nullptr, nullptr);
             napi_valuetype valuetype;
@@ -611,12 +612,18 @@ namespace OHOS::Util {
                     HILOG_ERROR("can not get src value");
                     return nullptr;
                 }
+                orgEncoding = buffer;
+                for (char &temp : buffer) {
+                    temp = std::tolower(static_cast<unsigned char>(temp));
+                }
                 NAPI_ASSERT(env, CheckEncodingFormat(buffer),
                             "Wrong encoding format, the current encoding format is not support");
-                enconding = buffer;
+                encoding = buffer;
             }
         }
-        auto object = new TextEncoder(enconding);
+        auto object = new TextEncoder(encoding);
+        object->SetOrgEncoding(orgEncoding);
+        object->SetApiIsolated(env);
         napi_wrap(
             env, thisVar, object,
             [](napi_env environment, void *data, void *hint) {
diff --git a/js_util_module/util/test/test_util.cpp b/js_util_module/util/test/test_util.cpp
index e6d9174ced4f4e081717819fc988ac777bbe520a..45bf61a104deb5eba0f94994b0174b6962ef053a 100644
--- a/js_util_module/util/test/test_util.cpp
+++ b/js_util_module/util/test/test_util.cpp
@@ -165,6 +165,7 @@ HWTEST_F(NativeEngineTest, getEncodingTest001, testing::ext::TestSize.Level0)
     napi_env env = (napi_env)engine_;
 
     OHOS::Util::TextEncoder textEncoder("GBK");
+    textEncoder.SetOrgEncoding("GBK");
     napi_value result = textEncoder.GetEncoding(env);
 
     char *buffer = nullptr;
@@ -192,6 +193,7 @@ HWTEST_F(NativeEngineTest, getEncodingTest002, testing::ext::TestSize.Level0)
     napi_env env = (napi_env)engine_;
 
     OHOS::Util::TextEncoder textEncoder("gb18030");
+    textEncoder.SetOrgEncoding("gb18030");
     napi_value result = textEncoder.GetEncoding(env);
 
     char *buffer = nullptr;
@@ -219,6 +221,7 @@ HWTEST_F(NativeEngineTest, getEncodingTest003, testing::ext::TestSize.Level0)
     napi_env env = (napi_env)engine_;
 
     OHOS::Util::TextEncoder textEncoder("GB18030");
+    textEncoder.SetOrgEncoding("GB18030");
     napi_value result = textEncoder.GetEncoding(env);
 
     char *buffer = nullptr;