diff --git a/src/core/algorithm/hnsw/hnsw_algorithm.cc b/src/core/algorithm/hnsw/hnsw_algorithm.cc
index 9a41258..955d2f4 100644
--- a/src/core/algorithm/hnsw/hnsw_algorithm.cc
+++ b/src/core/algorithm/hnsw/hnsw_algorithm.cc
@@ -106,28 +106,6 @@ int HnswAlgorithm::search(HnswContext *ctx) const {
   return 0;
 }
 
-int HnswAlgorithm::fast_search(HnswContext *ctx) const {
-  auto max_level = entity_.cur_max_level();
-  auto entry_point = entity_.entry_point();
-
-  dist_t dist = ctx->dist_calculator().dist(entry_point);
-  for (level_t cur_level = max_level; cur_level >= 1; --cur_level) {
-    select_entry_point(cur_level, &entry_point, &dist, ctx);
-  }
-
-  auto &topk_heap = ctx->topk_heap();
-  topk_heap.clear();
-
-  search_neighbors(0, &entry_point, &dist, topk_heap, ctx);
-
-  if (ctx->group_by_search()) {
-    expand_neighbors_by_group(topk_heap, ctx);
-  }
-
-  return 0;
-}
-
-
 //! select_entry_point on hnsw level, ef = 1
 void HnswAlgorithm::select_entry_point(level_t level, node_id_t *entry_point,
                                        dist_t *dist, HnswContext *ctx) const {
diff --git a/src/core/algorithm/hnsw/hnsw_algorithm.h b/src/core/algorithm/hnsw/hnsw_algorithm.h
index b345484..886d870 100644
--- a/src/core/algorithm/hnsw/hnsw_algorithm.h
+++ b/src/core/algorithm/hnsw/hnsw_algorithm.h
@@ -43,14 +43,10 @@ class HnswAlgorithm {
   //! return 0 on success, or errCode in failure
   int add_node(node_id_t id, level_t level, HnswContext *ctx);
 
-  //! do knn search in graph with lock
+  //! do knn search in graph
   //! return 0 on success, or errCode in failure. results saved in ctx
   int search(HnswContext *ctx) const;
 
-  //! do knn search in graph without lock
-  //! return 0 on success, or errCode in failure. results saved in ctx
-  int fast_search(HnswContext *ctx) const;
-
   //! Initiate HnswAlgorithm
   int init() {
     level_probas_.clear();
diff --git a/src/core/algorithm/hnsw/hnsw_searcher.cc b/src/core/algorithm/hnsw/hnsw_searcher.cc
index ac3cdef..89535b2 100644
--- a/src/core/algorithm/hnsw/hnsw_searcher.cc
+++ b/src/core/algorithm/hnsw/hnsw_searcher.cc
@@ -218,7 +218,7 @@ int HnswSearcher::search_impl(const void *query, const IndexQueryMeta &qmeta,
   ctx->resize_results(count);
   for (size_t q = 0; q < count; ++q) {
     ctx->reset_query(query);
-    int ret = alg_->fast_search(ctx);
+    int ret = alg_->search(ctx);
     if (ailego_unlikely(ret != 0)) {
       LOG_ERROR("Hnsw searcher fast search failed");
       return ret;
diff --git a/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.cc b/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.cc
index 6dd47a1..99b8058 100644
--- a/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.cc
+++ b/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.cc
@@ -108,28 +108,6 @@ int HnswSparseAlgorithm::search(HnswSparseContext *ctx) const {
   return 0;
 }
 
-int HnswSparseAlgorithm::fast_search(HnswSparseContext *ctx) const {
-  auto max_level = entity_.cur_max_level();
-  auto entry_point = entity_.entry_point();
-
-  dist_t dist = ctx->dist_calculator().dist(entry_point);
-  for (level_t cur_level = max_level; cur_level >= 1; --cur_level) {
-    select_entry_point(cur_level, &entry_point, &dist, ctx);
-  }
-
-  auto &topk_heap = ctx->topk_heap();
-  topk_heap.clear();
-
-  search_neighbors(0, &entry_point, &dist, topk_heap, ctx);
-
-  if (ctx->group_by_search()) {
-    expand_neighbors_by_group(topk_heap, ctx);
-  }
-
-  return 0;
-}
-
-
 //! select_entry_point on hnsw level, ef = 1
 void HnswSparseAlgorithm::select_entry_point(level_t level,
                                              node_id_t *entry_point,
diff --git a/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.h b/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.h
index fa5fab5..5a7093f 100644
--- a/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.h
+++ b/src/core/algorithm/hnsw_sparse/hnsw_sparse_algorithm.h
@@ -40,14 +40,10 @@ class HnswSparseAlgorithm {
   //! return 0 on success, or errCode in failure
   int add_node(node_id_t id, level_t level, HnswSparseContext *ctx);
 
-  //! do knn search in graph with lock
+  //! do knn search in graph
   //! return 0 on success, or errCode in failure. results saved in ctx
   int search(HnswSparseContext *ctx) const;
 
-  //! do knn search in graph without lock
-  //! return 0 on success, or errCode in failure. results saved in ctx
-  int fast_search(HnswSparseContext *ctx) const;
-
   //! Initiate HnswAlgorithm
   int init() {
     level_probas_.clear();
diff --git a/src/core/algorithm/hnsw_sparse/hnsw_sparse_searcher.cc b/src/core/algorithm/hnsw_sparse/hnsw_sparse_searcher.cc
index 9f1ee66..069532b 100644
--- a/src/core/algorithm/hnsw_sparse/hnsw_sparse_searcher.cc
+++ b/src/core/algorithm/hnsw_sparse/hnsw_sparse_searcher.cc
@@ -261,7 +261,7 @@ int HnswSparseSearcher::search_impl(const uint32_t *sparse_count,
       ctx->reset_query(sparse_query_buffer.data());
     }
 
-    int ret = alg_->fast_search(ctx);
+    int ret = alg_->search(ctx);
     if (ailego_unlikely(ret != 0)) {
       LOG_ERROR("Hnsw searcher fast search failed");
       return ret;