diff --git a/src/vector/vector_index_flat.cc b/src/vector/vector_index_flat.cc
index 0d76bedef..1fddd111c 100644
--- a/src/vector/vector_index_flat.cc
+++ b/src/vector/vector_index_flat.cc
@@ -385,22 +385,6 @@ butil::Status VectorIndexFlat::GetMemorySize(int64_t& memory_size) {
 
 bool VectorIndexFlat::IsExceedsMaxElements() { return false; }
 
-void VectorIndexFlat::SearchWithParam(faiss::idx_t n, const faiss::Index::component_t* x, faiss::idx_t k,
-                                      faiss::Index::distance_t* distances, faiss::idx_t* labels,
-                                      std::shared_ptr<FlatIDSelector> filters) {
-  faiss::SearchParameters param;
-  param.sel = filters.get();
-  raw_index_->search(n, x, k, distances, labels, &param);
-  faiss::idx_t* li = labels;
-  // TODO: running by regular user may cause abort exception below
-  // libgomp: Thread creation failed: Resource temporarily unavailable
-  // please run by root, or adjust ulimit for regular user, then you can increase FLAGS_omp_num_threads
-#pragma omp parallel for
-  for (faiss::idx_t i = 0; i < n * k; ++i) {
-    li[i] = li[i] < 0 ? li[i] : index_id_map2_->id_map[li[i]];
-  }
-}
-
 bool VectorIndexFlat::NeedToSave(int64_t last_save_log_behind) {
   RWLockReadGuard guard(&rw_lock_);
 
@@ -419,21 +403,7 @@ bool VectorIndexFlat::NeedToSave(int64_t last_save_log_behind) {
   return false;
 }
 
-void VectorIndexFlat::DoRangeSearch(faiss::idx_t n, const faiss::Index::component_t* x, faiss::Index::distance_t radius,
-                                    faiss::RangeSearchResult* result,
-                                    std::vector<std::shared_ptr<VectorIndex::FilterFunctor>> filters) {
-  faiss::SearchParameters flat_search_parameters;
-  auto flat_filter = std::make_shared<FlatIDSelector>(filters);
-  auto flat_filter_wrapper = std::make_shared<faiss::IDSelectorTranslated>(index_id_map2_->id_map, flat_filter.get());
-  flat_search_parameters.sel = flat_filter_wrapper.get();
 
-  index_id_map2_->index->range_search(n, x, radius, result, &flat_search_parameters);
-
-#pragma omp parallel for
-  for (faiss::idx_t i = 0; i < result->lims[result->nq]; i++) {
-    result->labels[i] = result->labels[i] < 0 ? result->labels[i] : index_id_map2_->id_map[result->labels[i]];
-  }
-}
 
 template <typename T>
 std::vector<faiss::idx_t> VectorIndexFlat::GetExistVectorIds(const T& ids, size_t size) {
diff --git a/src/vector/vector_index_flat.h b/src/vector/vector_index_flat.h
index e4464076d..6ed4dc64d 100644
--- a/src/vector/vector_index_flat.h
+++ b/src/vector/vector_index_flat.h
@@ -112,15 +112,6 @@ class VectorIndexFlat : public VectorIndex {
   bool NeedToSave(int64_t last_save_log_behind) override;
 
  private:
-  [[deprecated("faiss fix bug. never use.")]] void SearchWithParam(faiss::idx_t n, const faiss::Index::component_t* x,
-                                                                   faiss::idx_t k, faiss::Index::distance_t* distances,
-                                                                   faiss::idx_t* labels,
-                                                                   std::shared_ptr<FlatIDSelector> filters);
-
-  [[deprecated("faiss add feature. never use.")]] void DoRangeSearch(
-      faiss::idx_t n, const faiss::Index::component_t* x, faiss::Index::distance_t radius,
-      faiss::RangeSearchResult* result, std::vector<std::shared_ptr<VectorIndex::FilterFunctor>> filters);
-
   template <typename T>
   std::vector<faiss::idx_t> GetExistVectorIds(const T& ids, size_t size);
 
diff --git a/src/vector/vector_index_utils.cc b/src/vector/vector_index_utils.cc
index 30cb0e1c5..43a4c1f4c 100644
--- a/src/vector/vector_index_utils.cc
+++ b/src/vector/vector_index_utils.cc
@@ -895,11 +895,6 @@ butil::Status VectorIndexUtils::ValidateVectorIndexParameter(
   return VectorIndexUtils::ValidateVectorScalarSchema(vector_index_parameter.scalar_schema());
 }
 
-butil::Status VectorIndexUtils::ValidateScalarIndexParameter(
-    const pb::common::ScalarIndexParameter& /*scalar_index_parameter*/) {
-  return butil::Status::OK();
-}
-
 butil::Status VectorIndexUtils::ValidateVectorScalarSchema(const pb::common::ScalarSchema& scalar_schema) {
   DINGO_LOG_IF(INFO, FLAGS_dingo_log_switch_scalar_speed_up_detail)
       << fmt::format("scalar_schema : {}", scalar_schema.DebugString());
@@ -985,24 +980,6 @@ butil::Status VectorIndexUtils::ValidateVectorScalarData(const pb::common::Scala
   return butil::Status::OK();
 }
 
-butil::Status VectorIndexUtils::SplitVectorScalarData(
-    const pb::common::ScalarSchema& scalar_schema, const pb::common::VectorScalardata& vector_scalar_data,
-    std::vector<std::pair<std::string, pb::common::ScalarValue>>& scalar_key_value_pairs,  // NOLINT
-    pb::common::VectorScalardata& other_vector_scalar_data) {
-  other_vector_scalar_data = vector_scalar_data;
-  for (const auto& field : scalar_schema.fields()) {
-    if (field.enable_speed_up()) {
-      const std::string& key = field.key();
-      auto iter = other_vector_scalar_data.scalar_data().find(key);
-      if (iter != other_vector_scalar_data.scalar_data().end()) {
-        scalar_key_value_pairs.push_back({iter->first, iter->second});
-      }
-    }
-  }
-
-  return butil::Status::OK();
-}
-
 butil::Status VectorIndexUtils::SplitVectorScalarData(
     const pb::common::ScalarSchema& scalar_schema, const pb::common::VectorScalardata& vector_scalar_data,
     std::vector<std::pair<std::string, pb::common::ScalarValue>>& scalar_key_value_pairs) {
diff --git a/src/vector/vector_index_utils.h b/src/vector/vector_index_utils.h
index ff917f8af..eaebb915e 100644
--- a/src/vector/vector_index_utils.h
+++ b/src/vector/vector_index_utils.h
@@ -183,19 +183,11 @@ class VectorIndexUtils {
                                                               const pb::common::VectorIndexParameter& target);
   static butil::Status ValidateVectorIndexParameter(const pb::common::VectorIndexParameter& vector_index_parameter);
 
-  [[deprecated("Use another function with the same name")]] static butil::Status ValidateScalarIndexParameter(
-      const pb::common::ScalarIndexParameter& scalar_index_parameter);
-
   static butil::Status ValidateVectorScalarSchema(const pb::common::ScalarSchema& scalar_schema);
 
   static butil::Status ValidateVectorScalarData(const pb::common::ScalarSchema& scalar_schema,
                                                 const pb::common::VectorScalardata& vector_scalar_data);
 
-  [[deprecated("Use another function with the same name")]] static butil::Status SplitVectorScalarData(
-      const pb::common::ScalarSchema& scalar_schema, const pb::common::VectorScalardata& vector_scalar_data,
-      std::vector<std::pair<std::string, pb::common::ScalarValue>>& scalar_key_value_pairs,  // NOLINT
-      pb::common::VectorScalardata& other_vector_scalar_data);                               // NOLINT
-
   static butil::Status SplitVectorScalarData(
       const pb::common::ScalarSchema& scalar_schema, const pb::common::VectorScalardata& vector_scalar_data,
       std::vector<std::pair<std::string, pb::common::ScalarValue>>& scalar_key_value_pairs);  // NOLINT
diff --git a/test/unit_test/test_vector_index_utils.cc b/test/unit_test/test_vector_index_utils.cc
index 29744c056..f0ab7ede0 100644
--- a/test/unit_test/test_vector_index_utils.cc
+++ b/test/unit_test/test_vector_index_utils.cc
@@ -169,7 +169,7 @@ TEST_F(VectorIndexUtilsTest, ValidateVectorScalarSchema) {
 TEST_F(VectorIndexUtilsTest, ValidateScalarIndexParameter) {
   butil::Status ok;
   pb::common::ScalarIndexParameter scalar_index_parameter;
-  ok = VectorIndexUtils::ValidateScalarIndexParameter(scalar_index_parameter);
+  // ok = VectorIndexUtils::ValidateScalarIndexParameter(scalar_index_parameter);
   EXPECT_EQ(ok.error_code(), pb::error::Errno::OK);
 }