diff --git a/metrics/grafana/tidb.json b/metrics/grafana/tidb.json
index 4f7bb048f7..3f8e596e03 100644
--- a/metrics/grafana/tidb.json
+++ b/metrics/grafana/tidb.json
@@ -4422,7 +4422,7 @@
           "reverseYBuckets": false,
           "targets": [
             {
-              "expr": "sum(increase(tidb_tikvclient_txn_regions_num_bucket{instance=~\"$instance\"}[1m])) by (le)",
+              "expr": "sum(increase(tidb_tikvclient_txn_regions_num_bucket{instance=~\"$instance\", type=\"2pc_prewrite\"}[1m])) by (le)",
               "format": "heatmap",
               "intervalFactor": 2,
               "legendFormat": "{{le}}",