diff --git a/pipeline_bidding/bid_flow.py b/pipeline_bidding/bid_flow.py
index b3e395a..705bb04 100644
--- a/pipeline_bidding/bid_flow.py
+++ b/pipeline_bidding/bid_flow.py
@@ -159,11 +159,12 @@ async def _dim_qc_improvements(sor, project_id, dim):
 
 async def _open_qc_type_tasks(sor, project_id, qc_type):
     """某类型在办 QC 审核任务数（params.qc_types 含该类型）。"""
+    kw = '%"qc_types": ["' + qc_type + '"]%'   # 拼接构造：SQL 里 % 是 LIKE 通配符，不能用 % 格式化
     recs = await sor.sqlExe(
         "SELECT COUNT(*) AS c FROM pipeline_tasks WHERE tenant_id=${p}$ "
         "AND pipeline_id='role_task' AND role=${r}$ AND state IN "
         "('submitted','running','review','qc_review') AND params LIKE ${kw}$",
-        {"p": project_id, "r": R_QC, "kw": '%"qc_types": ["%s"]%' % qc_type})
+        {"p": project_id, "r": R_QC, "kw": kw})
     await sor.sqlExe("COMMIT", {})
     return to_int(getattr(recs[0], "c", 0) if recs else 0)