diff --git a/ruoyi-fastapi-backend/module_admin/service/kb_es_service.py b/ruoyi-fastapi-backend/module_admin/service/kb_es_service.py
index dd46fcb..8bc58fb 100644
--- a/ruoyi-fastapi-backend/module_admin/service/kb_es_service.py
+++ b/ruoyi-fastapi-backend/module_admin/service/kb_es_service.py
@@ -79,7 +79,11 @@ class KBESService:
         chunks, metrics_raw = await cls._es_search(question)
         retrieve_ms = (time.perf_counter() - t0) * 1000
 
-        chunks, best_cov = cls._rerank_chunks(question, chunks)
+        # KB_PROVIDER=es_bm25 场景：以 ES 返回的原始排序为准（与手工 curl 对齐），不做二次重排。
+        if KBConfig.KB_PROVIDER == 'es_bm25':
+            best_cov = cls._rerank_chunks(question, chunks)[1]
+        else:
+            chunks, best_cov = cls._rerank_chunks(question, chunks)
 
         top1 = float(chunks[0].get("_score") or 0.0) if chunks else 0.0
         top2 = float(chunks[1].get("_score") or 0.0) if len(chunks) > 1 else 0.0