diff --git a/be/src/common/config.h b/be/src/common/config.h
index 736381873b..80e821c536 100644
--- a/be/src/common/config.h
+++ b/be/src/common/config.h
@@ -585,7 +585,7 @@ CONF_mInt32(storage_flood_stage_usage_percent, "90"); // 90%
 // The min bytes that should be left of a data dir
 CONF_mInt64(storage_flood_stage_left_capacity_bytes, "1073741824"); // 1GB
 // number of thread for flushing memtable per store
-CONF_Int32(flush_thread_num_per_store, "2");
+CONF_Int32(flush_thread_num_per_store, "6");
 // number of thread for flushing memtable per store, for high priority load task
 CONF_Int32(high_priority_flush_thread_num_per_store, "1");