diff --git a/cpp/src/common/tablet.cc b/cpp/src/common/tablet.cc
index 086717932..2b4fd37e0 100644
--- a/cpp/src/common/tablet.cc
+++ b/cpp/src/common/tablet.cc
@@ -280,7 +280,7 @@ int Tablet::add_value(uint32_t row_index, const std::string &measurement_name,
     if (err_code_ != E_OK) {
         return err_code_;
     }
-    SchemaMapIterator find_iter = schema_map_.find(measurement_name);
+    SchemaMapIterator find_iter = schema_map_.find(to_lower(measurement_name));
     if (LIKELY(find_iter == schema_map_.end())) {
         ret = E_INVALID_ARG;
     } else {
diff --git a/cpp/test/writer/table_view/tsfile_writer_table_test.cc b/cpp/test/writer/table_view/tsfile_writer_table_test.cc
index b1ef896a9..44297b172 100644
--- a/cpp/test/writer/table_view/tsfile_writer_table_test.cc
+++ b/cpp/test/writer/table_view/tsfile_writer_table_test.cc
@@ -521,7 +521,7 @@ TEST_F(TsFileWriterTableTest, WriteWithNullAndEmptyTag) {
 
     for (int i = 0; i < 10; i++) {
         tablet.add_timestamp(i, static_cast<int64_t>(time++));
-        tablet.add_value(i, 0, "tag1");
+        tablet.add_value(i, "ID0", "tag1");
         tablet.add_value(i, 1, "tag2");
         tablet.add_value(i, 2, "tag3");
         tablet.add_value(i, 3, 100.0f);