diff --git a/api/apps/sdk/session.py b/api/apps/sdk/session.py
index db388a0d9..36b407cea 100644
--- a/api/apps/sdk/session.py
+++ b/api/apps/sdk/session.py
@@ -1049,11 +1049,13 @@ async def retrieval_test_embedded():
     use_kg = req.get("use_kg", False)
     top = int(req.get("top_k", 1024))
     langs = req.get("cross_languages", [])
+    rerank_id = req.get("rerank_id", "")
     tenant_id = objs[0].tenant_id
     if not tenant_id:
         return get_error_data_result(message="permission denined.")
 
     async def _retrieval():
+        nonlocal similarity_threshold, vector_similarity_weight, top, rerank_id
         local_doc_ids = list(doc_ids) if doc_ids else []
         tenant_ids = []
         _question = question
@@ -1065,6 +1067,15 @@ async def retrieval_test_embedded():
             meta_data_filter = search_config.get("meta_data_filter", {})
             if meta_data_filter.get("method") in ["auto", "semi_auto"]:
                 chat_mdl = LLMBundle(tenant_id, LLMType.CHAT, llm_name=search_config.get("chat_id", ""))
+            # Apply search_config settings if not explicitly provided in request
+            if not req.get("similarity_threshold"):
+                similarity_threshold = float(search_config.get("similarity_threshold", similarity_threshold))
+            if not req.get("vector_similarity_weight"):
+                vector_similarity_weight = float(search_config.get("vector_similarity_weight", vector_similarity_weight))
+            if not req.get("top_k"):
+                top = int(search_config.get("top_k", top))
+            if not req.get("rerank_id"):
+                rerank_id = search_config.get("rerank_id", "")
         else:
             meta_data_filter = req.get("meta_data_filter") or {}
             if meta_data_filter.get("method") in ["auto", "semi_auto"]:
@@ -1094,8 +1105,8 @@ async def retrieval_test_embedded():
         embd_mdl = LLMBundle(kb.tenant_id, LLMType.EMBEDDING.value, llm_name=kb.embd_id)
 
         rerank_mdl = None
-        if req.get("rerank_id"):
-            rerank_mdl = LLMBundle(kb.tenant_id, LLMType.RERANK.value, llm_name=req["rerank_id"])
+        if rerank_id:
+            rerank_mdl = LLMBundle(kb.tenant_id, LLMType.RERANK.value, llm_name=rerank_id)
 
         if req.get("keyword", False):
             chat_mdl = LLMBundle(kb.tenant_id, LLMType.CHAT)
diff --git a/web/src/pages/next-search/search-setting.tsx b/web/src/pages/next-search/search-setting.tsx
index 6b08bf184..c0bf71b9c 100644
--- a/web/src/pages/next-search/search-setting.tsx
+++ b/web/src/pages/next-search/search-setting.tsx
@@ -39,7 +39,7 @@ import { IKnowledge } from '@/interfaces/database/knowledge';
 import { cn } from '@/lib/utils';
 import { zodResolver } from '@hookform/resolvers/zod';
 import { X } from 'lucide-react';
-import { useCallback, useEffect, useMemo, useState } from 'react';
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { useForm, useWatch } from 'react-hook-form';
 import { useTranslation } from 'react-i18next';
 import { z } from 'zod';
@@ -226,11 +226,21 @@ const SearchSetting: React.FC<SearchSettingProps> = ({
     control: formMethods.control,
     name: 'search_config.use_rerank',
   });
+
   const aiSummaryDisabled = useWatch({
     control: formMethods.control,
     name: 'search_config.summary',
   });
 
+  // Reset top_k to 1024 only when user actively disables rerank (from true to false)
+  const prevRerankEnabled = useRef<boolean | undefined>(undefined);
+  useEffect(() => {
+    if (prevRerankEnabled.current === true && rerankModelDisabled === false) {
+      formMethods.setValue('search_config.top_k', 1024);
+    }
+    prevRerankEnabled.current = rerankModelDisabled;
+  }, [rerankModelDisabled, formMethods]);
+
   const { updateSearch } = useUpdateSearch();
   const [formSubmitLoading, setFormSubmitLoading] = useState(false);
   const { data: systemSetting } = useFetchTenantInfo();