diff --git a/backend/package/yuxi/knowledge/base.py b/backend/package/yuxi/knowledge/base.py
index f2d74519..0ccbf048 100644
--- a/backend/package/yuxi/knowledge/base.py
+++ b/backend/package/yuxi/knowledge/base.py
@@ -453,6 +453,7 @@ class KnowledgeBase(ABC):
             "llm_info": llm_info.model_dump() if hasattr(llm_info, "model_dump") else llm_info,
             "metadata": kwargs,
             "created_at": utc_isoformat(),
+            "query_params": self._get_default_query_params(db_id),
         }
         await self._persist_kb(db_id)
 
@@ -642,6 +643,15 @@ class KnowledgeBase(ABC):
             return query_params_meta.get("options", {})
         return {}
 
+    def _get_default_query_params(self, db_id: str) -> dict[str, Any]:
+        """从 get_query_params_config 中提取所有参数的默认值，返回 {"options": {...}}"""
+        config = self.get_query_params_config(db_id)
+        defaults = {}
+        for opt in config.get("options", []):
+            if "default" in opt:
+                defaults[opt["key"]] = opt["default"]
+        return {"options": defaults}
+
     def get_database_info(self, db_id: str, include_files: bool = True) -> dict | None:
         """
         获取数据库详细信息
@@ -1046,7 +1056,7 @@ class KnowledgeBase(ABC):
                 "kb_type": kb.kb_type,
                 "embed_info": kb.embed_info,
                 "llm_info": kb.llm_info,
-                "query_params": kb.query_params,
+                "query_params": kb.query_params or self._get_default_query_params(kb.db_id),
                 "metadata": ensure_chunk_defaults_in_additional_params(kb.additional_params),
                 "created_at": utc_isoformat(kb.created_at) if kb.created_at else utc_isoformat(),
             }
diff --git a/backend/package/yuxi/services/evaluation_service.py b/backend/package/yuxi/services/evaluation_service.py
index bff59ac4..984d7010 100644
--- a/backend/package/yuxi/services/evaluation_service.py
+++ b/backend/package/yuxi/services/evaluation_service.py
@@ -363,6 +363,10 @@ class EvaluationService:
                 kb_row = await self.kb_repo.get_by_id(db_id)
                 query_params = (kb_row.query_params if kb_row else None) or {}
                 retrieval_config = query_params.get("options", {}) if isinstance(query_params, dict) else {}
+                if not retrieval_config:
+                    kb_instance = await knowledge_base.aget_kb(db_id)
+                    if kb_instance:
+                        retrieval_config = kb_instance._get_default_query_params(db_id).get("options", {})
                 logger.info(f"从知识库 {db_id} 加载检索配置: {list(retrieval_config.keys())}")
             except Exception as e:
                 logger.error(f"获取知识库检索配置失败: {e}")
diff --git a/web/src/components/DebugComponent.vue b/web/src/components/DebugComponent.vue
index 35501940..c564d951 100644
--- a/web/src/components/DebugComponent.vue
+++ b/web/src/components/DebugComponent.vue
@@ -681,8 +681,8 @@ const switchToUser = async (user) => {
 .log-container {
   height: calc(80vh - 200px);
   overflow-y: auto;
-  background: var(--gray-0);
-  color: var(--gray-1000);
+  background: #1e1f1f;
+  color: #ffffff;
   border-radius: 5px;
   font-family: 'Consolas', 'Monaco', monospace;
   font-size: 12px;
@@ -754,12 +754,6 @@ const switchToUser = async (user) => {
   color: var(--gray-500);
 }
 
-@media (prefers-color-scheme: dark) {
-  .log-container {
-    background: var(--gray-900);
-  }
-}
-
 :fullscreen .log-container {
   height: calc(100vh - 160px);
 }