diff --git a/be/src/common/config.cpp b/be/src/common/config.cpp
index 04e537cd3241bc..5468ac29a02385 100644
--- a/be/src/common/config.cpp
+++ b/be/src/common/config.cpp
@@ -592,7 +592,7 @@ DEFINE_mInt64(write_buffer_size, "104857600");
 // max buffer size used in memtable for the aggregated table, default 400MB
 DEFINE_mInt64(write_buffer_size_for_agg, "419430400");
 // max parallel flush task per memtable writer
-DEFINE_mInt32(memtable_flush_running_count_limit, "5");
+DEFINE_mInt32(memtable_flush_running_count_limit, "2");
 
 DEFINE_Int32(load_process_max_memory_limit_percent, "50"); // 50%