diff --git a/interfaces/kits/js/src/mod_fs/class_readeriterator/readeriterator_n_exporter.cpp b/interfaces/kits/js/src/mod_fs/class_readeriterator/readeriterator_n_exporter.cpp
index d7ee0c856f60799cbfbb2f0cf0fc6ce2e468b2cc..617869db0796c20cd52b71ad176702c52cdf4d2b 100644
--- a/interfaces/kits/js/src/mod_fs/class_readeriterator/readeriterator_n_exporter.cpp
+++ b/interfaces/kits/js/src/mod_fs/class_readeriterator/readeriterator_n_exporter.cpp
@@ -73,7 +73,7 @@ napi_value ReaderIteratorNExporter::Next(napi_env env, napi_callback_info info)
     objReaderIteratorResult.AddProp("done", NVal::CreateBool(env, (readerIteratorEntity->offset == 0)).val_);
     if (str != nullptr) {
         objReaderIteratorResult.AddProp("value", NVal::CreateUTF8String(env, str->str, str->len).val_);
-        readerIteratorEntity->offset -= str->len;
+        readerIteratorEntity->offset -= static_cast<int64_t>(str->len);
     } else {
         objReaderIteratorResult.AddProp("value", NVal::CreateUTF8String(env, "").val_);
         (void)NClass::RemoveEntityOfFinal<ReaderIteratorEntity>(env, funcArg.GetThisVar());
diff --git a/interfaces/kits/js/src/mod_fs/properties/read_text.cpp b/interfaces/kits/js/src/mod_fs/properties/read_text.cpp
index 262f52da0dbf8a3cdd5f82e7e6ccc268dc93cc41..da1693ca3a143e4a718072bb097b50bd643035e2 100755
--- a/interfaces/kits/js/src/mod_fs/properties/read_text.cpp
+++ b/interfaces/kits/js/src/mod_fs/properties/read_text.cpp
@@ -37,7 +37,7 @@ static tuple<bool, int64_t, bool, int64_t, unique_ptr<char[]>> GetReadTextArg(na
     int64_t len = 0;
     bool succ = false;
     bool hasLen = false;
-    unique_ptr<char[]> encoding;
+    unique_ptr<char[]> encoding { new char[]{ "utf-8" } };
 
     if (op.HasProp("offset") && !op.GetProp("offset").TypeIs(napi_undefined)) {
         tie(succ, offset) = op.GetProp("offset").ToInt64();