diff --git a/configs/milvus.yaml b/configs/milvus.yaml
index 83c9ddb034..c725efb15c 100644
--- a/configs/milvus.yaml
+++ b/configs/milvus.yaml
@@ -243,7 +243,7 @@ queryNode:
     memoryLimit: 2147483648 # 2 GB, 2 * 1024 *1024 *1024
   grouping:
     enabled: true
-    maxNQ: 50000
+    maxNQ: 1000
     topKMergeRatio: 20
   scheduler:
     receiveChanSize: 10240
diff --git a/pkg/util/paramtable/component_param.go b/pkg/util/paramtable/component_param.go
index 325e1c33b7..441baf6fa3 100644
--- a/pkg/util/paramtable/component_param.go
+++ b/pkg/util/paramtable/component_param.go
@@ -1694,7 +1694,7 @@ Max read concurrency must greater than or equal to 1, and less than or equal to
 	p.MaxGroupNQ = ParamItem{
 		Key:          "queryNode.grouping.maxNQ",
 		Version:      "2.0.0",
-		DefaultValue: "50000",
+		DefaultValue: "1000",
 		Export:       true,
 	}
 	p.MaxGroupNQ.Init(base.mgr)