diff --git a/engine/gamma/index/gamma_index.h b/engine/gamma/index/gamma_index.h
index 25b4c98a..032497f9 100644
--- a/engine/gamma/index/gamma_index.h
+++ b/engine/gamma/index/gamma_index.h
@@ -137,7 +137,7 @@ struct GammaIndex {
   virtual int Dump(const std::string &dir) = 0;
   virtual int Load(const std::vector<std::string> &index_dirs) = 0;
 
-  size_t d_;
+  int d_;
 
   const char *docids_bitmap_;
   RawVector *raw_vec_;
diff --git a/engine/gamma/index/gamma_index_factory.h b/engine/gamma/index/gamma_index_factory.h
index 93c8785b..543ea24b 100644
--- a/engine/gamma/index/gamma_index_factory.h
+++ b/engine/gamma/index/gamma_index_factory.h
@@ -17,7 +17,7 @@
 namespace tig_gamma {
 
 class GammaIndexFactory {
-public:
+ public:
   static GammaIndex *Create(RetrievalModel model, size_t dimension,
                             const char *docids_bitmap, RawVector *raw_vec,
                             IVFPQParameters *ivfpq_param) {
@@ -26,24 +26,35 @@ class GammaIndexFactory {
       return nullptr;
     }
     switch (model) {
-    case IVFPQ: {
-      faiss::IndexFlatL2 *coarse_quantizer = new faiss::IndexFlatL2(dimension);
-      return (GammaIndex *)new GammaIVFPQIndex(
-          coarse_quantizer, dimension, ivfpq_param->ncentroids,
-          ivfpq_param->nsubvector, ivfpq_param->nbits_per_idx, docids_bitmap,
-          raw_vec, ivfpq_param->nprobe);
-      break;
-    }
-
-    default: {
-      throw std::invalid_argument("invalid raw feature type");
-      break;
-    }
+      case IVFPQ: {
+        if (dimension % ivfpq_param->nsubvector != 0) {
+          dimension = (dimension / ivfpq_param->nsubvector + 1) *
+                      ivfpq_param->nsubvector;
+          LOG(INFO) << "Dimension [" << raw_vec->GetDimension()
+                    << "] cannot divide by nsubvector ["
+                    << ivfpq_param->nsubvector << "], adjusted to ["
+                    << dimension << "]";
+        }
+
+        faiss::IndexFlatL2 *coarse_quantizer =
+            new faiss::IndexFlatL2(dimension);
+
+        return (GammaIndex *)new GammaIVFPQIndex(
+            coarse_quantizer, dimension, ivfpq_param->ncentroids,
+            ivfpq_param->nsubvector, ivfpq_param->nbits_per_idx, docids_bitmap,
+            raw_vec, ivfpq_param->nprobe);
+        break;
+      }
+
+      default: {
+        throw std::invalid_argument("invalid raw feature type");
+        break;
+      }
     }
 
     return nullptr;
   }
 };
-} // namespace tig_gamma
+}  // namespace tig_gamma
 
-#endif // GAMMA_INDEX_FACTORY_H_
+#endif  // GAMMA_INDEX_FACTORY_H_
diff --git a/engine/gamma/index/gamma_index_ivfpq.cc b/engine/gamma/index/gamma_index_ivfpq.cc
index c7d83d1f..40d61d95 100644
--- a/engine/gamma/index/gamma_index_ivfpq.cc
+++ b/engine/gamma/index/gamma_index_ivfpq.cc
@@ -32,6 +32,18 @@
 
 namespace tig_gamma {
 
+static inline void ConvertVectorDim(size_t num, int raw_d, int d,
+                                    const float *raw_vec, float *vec) {
+  memset(vec, 0, num * d * sizeof(float));
+
+#pragma omp parallel for
+  for (size_t i = 0; i < num; ++i) {
+    for (int j = 0; j < raw_d; ++j) {
+      vec[i * d + j] = raw_vec[i * raw_d + j];
+    }
+  }
+}
+
 IndexIVFPQStats indexIVFPQ_stats;
 
 GammaIVFPQIndex::GammaIVFPQIndex(faiss::Index *quantizer, size_t d,
@@ -119,10 +131,31 @@ int GammaIVFPQIndex::Indexing() {
                << "] less then 8192, failed!";
     return -1;
   }
-  int num = vectors_count > 100000 ? 100000 : vectors_count;
+  size_t num = vectors_count > 100000 ? 100000 : vectors_count;
   const float *header = raw_vec_->GetVectorHeader(0, num);
-  train(num, header);
+
+  int raw_d = raw_vec_->GetDimension();
+
+  float *train_vec = nullptr;
+
+  if (d_ > raw_d) {
+    float *vec = new float[num * d_];
+
+    ConvertVectorDim(num, raw_d, d, header, vec);
+
+    train_vec = vec;
+  } else {
+    train_vec = const_cast<float *>(header);
+  }
+
+  train(num, train_vec);
+
+  if (d_ > raw_d) {
+    delete train_vec;
+  }
+
   raw_vec_->Destroy(header, true);
+
   LOG(INFO) << "train successed!";
   return 0;
 }
@@ -147,18 +180,32 @@ int GammaIVFPQIndex::AddRTVecsToIndex() {
 
     for (int i = 0; i < index_count; i++) {
       int start_docid = indexed_vec_count_;
-      int count_per_index =
+      size_t count_per_index =
           (i == (index_count - 1) ? total_stored_vecs - start_docid
                                   : MAX_NUM_PER_INDEX);
-      // const float *index_ptr = raw_vec_->GetVector(start_docid);
       const float *vector_head = raw_vec_->GetVectorHeader(
           indexed_vec_count_, indexed_vec_count_ + count_per_index);
-      // const float *index_ptr = vector_head + (uint64_t)start_docid * d_;
-      const float *index_ptr = vector_head;
-      if (!Add(count_per_index, index_ptr)) {
+
+      int raw_d = raw_vec_->GetDimension();
+      float *add_vec = nullptr;
+
+      if (d_ > raw_d) {
+        float *vec = new float[count_per_index * d_];
+
+        ConvertVectorDim(count_per_index, raw_d, d, vector_head, vec);
+        add_vec = vec;
+      } else {
+        add_vec = const_cast<float *>(vector_head);
+      }
+
+      if (!Add(count_per_index, add_vec)) {
         LOG(ERROR) << "add index from docid " << start_docid << " error!";
         ret = -2;
       }
+
+      if (d_ > raw_d) {
+        delete add_vec;
+      }
       raw_vec_->Destroy(vector_head, true);
     }
   }
@@ -310,13 +357,14 @@ void GammaIVFPQIndex::search_preassigned(
                       float *recall_simi, idx_t *recall_idxi) {
       std::vector<const float *> vecs(recall_num);
       raw_vec_->Gets(recall_num, recall_idxi, vecs);
+      int raw_d = raw_vec_->GetDimension();
       for (int j = 0; j < recall_num; j++) {
         if (recall_idxi[j] == -1) continue;
         float dis = 0;
         if (metric_type == faiss::METRIC_INNER_PRODUCT) {
-          dis = faiss::fvec_inner_product(xi, vecs[j], this->d);
+          dis = faiss::fvec_inner_product(xi, vecs[j], raw_d);
         } else {
-          dis = faiss::fvec_L2sqr(xi, vecs[j], this->d);
+          dis = faiss::fvec_L2sqr(xi, vecs[j], raw_d);
         }
 
         if (((condition->min_dist >= 0 && dis >= condition->min_dist) &&
@@ -405,7 +453,6 @@ void GammaIVFPQIndex::search_preassigned(
     int *vid_list_data = vid_list.data();
     int *curr_ptr = vid_list_data;
     for (size_t i = 0; i < docid_list.size(); i++) {
-      // vids_list[i] = this->raw_vec_->docid2vid_[docid_list[i]];
       if (bitmap::test(this->docids_bitmap_, docid_list[i])) {
         continue;
       }
@@ -900,7 +947,8 @@ int GammaIVFPQIndex::Search(const VectorQuery *query,
                             const GammaSearchCondition *condition,
                             VectorResult &result) {
   float *x = reinterpret_cast<float *>(query->value->value);
-  int n = query->value->len / (d * sizeof(float));
+  int raw_d = raw_vec_->GetDimension();
+  size_t n = query->value->len / (raw_d * sizeof(float));
 
   if (condition->metric_type == InnerProduct) {
     metric_type = faiss::METRIC_INNER_PRODUCT;
@@ -908,13 +956,30 @@ int GammaIVFPQIndex::Search(const VectorQuery *query,
     metric_type = faiss::METRIC_L2;
   }
   idx_t *idx = reinterpret_cast<idx_t *>(result.docids);
+
+  float *vec_q = nullptr;
+
+  if (d > raw_d) {
+    float *vec = new float[n * d];
+
+    ConvertVectorDim(n, raw_d, d, x, vec);
+
+    vec_q = vec;
+  } else {
+    vec_q = x;
+  }
+
   if (condition->use_direct_search) {
-    SearchDirectly(n, x, condition, result.dists, idx, result.total.data());
+    SearchDirectly(n, vec_q, condition, result.dists, idx, result.total.data());
   } else {
-    SearchIVFPQ(n, x, condition, result.dists, idx, result.total.data());
+    SearchIVFPQ(n, vec_q, condition, result.dists, idx, result.total.data());
   }
 
-  for (int i = 0; i < n; i++) {
+  if (d > raw_d) {
+    delete vec_q;
+  }
+
+  for (size_t i = 0; i < n; i++) {
     int pos = 0;
 
     std::map<int, int> docid2count;
diff --git a/engine/gamma/search/gamma_common_data.h b/engine/gamma/search/gamma_common_data.h
index 6928ba65..79a696b7 100644
--- a/engine/gamma/search/gamma_common_data.h
+++ b/engine/gamma/search/gamma_common_data.h
@@ -175,14 +175,10 @@ struct IVFPQParamHelper {
   void SetDefaultValue() {
     if (ivfpq_param_->metric_type == -1)
       ivfpq_param_->metric_type = InnerProduct;
-    if (ivfpq_param_->nprobe == -1)
-      ivfpq_param_->nprobe = 20;
-    if (ivfpq_param_->ncentroids == -1)
-      ivfpq_param_->ncentroids = 256;
-    if (ivfpq_param_->nsubvector == -1)
-      ivfpq_param_->nsubvector = 64;
-    if (ivfpq_param_->nbits_per_idx == -1)
-      ivfpq_param_->nbits_per_idx = 8;
+    if (ivfpq_param_->nprobe == -1) ivfpq_param_->nprobe = 20;
+    if (ivfpq_param_->ncentroids == -1) ivfpq_param_->ncentroids = 256;
+    if (ivfpq_param_->nsubvector == -1) ivfpq_param_->nsubvector = 64;
+    if (ivfpq_param_->nbits_per_idx == -1) ivfpq_param_->nbits_per_idx = 8;
   }
 
   bool Validate() {
diff --git a/engine/gamma/tests/README.md b/engine/gamma/tests/README.md
index aabda206..eedbb6d8 100644
--- a/engine/gamma/tests/README.md
+++ b/engine/gamma/tests/README.md
@@ -21,4 +21,4 @@ op8=>operation: Close engine
 st->op1->op2->op3->op4->op5->op6->op7->op8->e
 ```
 ## test
-`./test_files profile_10k.txt siftsmall_base.fvecs`
+`./test_files profile_10k.txt siftsmall_base.fvecs`
\ No newline at end of file
diff --git a/engine/gamma/tests/test_files.cc b/engine/gamma/tests/test_files.cc
index f5b08106..8a54bbc5 100644
--- a/engine/gamma/tests/test_files.cc
+++ b/engine/gamma/tests/test_files.cc
@@ -32,7 +32,7 @@ struct Options {
     max_doc_size = 10000 * 200;
     add_doc_num = 10000 * 100;
     search_num = 10000 * 1;
-    fields_vec = {"sku", "_id", "cid1", "cid2", "cid3"};
+    fields_vec = {"key", "_id", "field1", "field2", "field3"};
     fields_type = {LONG, STRING, STRING, INT, INT};
     vector_name = "abc";
     path = "files";
@@ -144,7 +144,7 @@ int SearchThread(void *engine, size_t num) {
 
     if (idx % 1000 == 0) LOG(INFO) << "idx=" << idx;
   
-    string name = "cid2";
+    string name = "field2";
     RangeFilter **range_filters = MakeRangeFilters(2);
     RangeFilter *range_filter =
         MakeRangeFilter(StringToByteArray(name), StringToByteArray(c1_lower),
@@ -155,7 +155,7 @@ int SearchThread(void *engine, size_t num) {
     upper = 999999;
     c1_lower = string((char *)&low, sizeof(low));
     c1_upper = string((char *)&upper, sizeof(upper));
-    name = "cid3";
+    name = "field3";
     range_filter =
         MakeRangeFilter(StringToByteArray(name), StringToByteArray(c1_lower),
                         StringToByteArray(c1_upper), false, true);
@@ -165,7 +165,7 @@ int SearchThread(void *engine, size_t num) {
     TermFilter *term_filter;
 
     std::string term_low = string("1315\00115248");
-    name = "cid1";
+    name = "field1";
     term_filter = MakeTermFilter(StringToByteArray(name),
                                  StringToByteArray(term_low), true);
     SetTermFilter(term_filters, 0, term_filter);
diff --git a/engine/gamma/vector/mmap_raw_vector.cc b/engine/gamma/vector/mmap_raw_vector.cc
index 1a3fc9aa..c10f2d99 100644
--- a/engine/gamma/vector/mmap_raw_vector.cc
+++ b/engine/gamma/vector/mmap_raw_vector.cc
@@ -77,7 +77,7 @@ MmapRawVector::~MmapRawVector() {
 }
 
 int MmapRawVector::Init() {
-  max_buffer_size_ = (int)((long)store_params_->cache_size_ * 1024 * 1024 / vector_byte_size_);
+  max_buffer_size_ = (int)(store_params_->cache_size_ / vector_byte_size_);
 
   fet_fd_ = open(fet_file_path_.c_str(), O_WRONLY | O_APPEND | O_CREAT, 00664);
   if (fet_fd_ == -1) {
@@ -91,6 +91,10 @@ int MmapRawVector::Init() {
     return -1;
   }
 
+  int remainder = max_buffer_size_ % buffer_chunk_num_;
+  if (remainder > 0) {
+    max_buffer_size_ += buffer_chunk_num_ - remainder;
+  }
   vector_buffer_queue_ =
       new VectorBufferQueue(max_buffer_size_, dimension_, buffer_chunk_num_);
   vector_file_mapper_ =
diff --git a/engine/gamma/vector/mmap_raw_vector.h b/engine/gamma/vector/mmap_raw_vector.h
index b2d6a8fa..0c39935b 100644
--- a/engine/gamma/vector/mmap_raw_vector.h
+++ b/engine/gamma/vector/mmap_raw_vector.h
@@ -5,8 +5,8 @@
  * found in the LICENSE file in the root directory of this source tree.
  */
 
-#ifndef MEMORY_DISK_RAW_VECTOR_H_
-#define MEMORY_DISK_RAW_VECTOR_H_
+#ifndef MMAP_RAW_VECTOR_H_
+#define MMAP_RAW_VECTOR_H_
 
 #include "raw_vector.h"
 #include "vector_buffer_queue.h"
@@ -49,4 +49,4 @@ class MmapRawVector : public RawVector, public AsyncFlusher {
 
 } // namespace tig_gamma
 
-#endif
+#endif // MMAP_RAW_VECTOR_H_
diff --git a/engine/gamma/vector/raw_vector.cc b/engine/gamma/vector/raw_vector.cc
index d864b86b..52176185 100644
--- a/engine/gamma/vector/raw_vector.cc
+++ b/engine/gamma/vector/raw_vector.cc
@@ -269,11 +269,11 @@ int StoreParams::Parse(const char *str) {
   double cache_size = 0;
   if (!jp.GetDouble("cache_size", cache_size)) {
     if (cache_size > MAX_CACHE_SIZE || cache_size < 0) {
-      LOG(ERROR) << "invalid cache size=" << cache_size
-                 << ", limit size=" << MAX_CACHE_SIZE;
+      LOG(ERROR) << "invalid cache size=" << cache_size << "M"
+                 << ", limit size=" << MAX_CACHE_SIZE << "M";
       return -1;
     }
-    cache_size_ = (int)cache_size;
+    cache_size_ = (long)cache_size * 1024 * 1024;
   }
 
   return 0;
diff --git a/engine/gamma/vector/raw_vector.h b/engine/gamma/vector/raw_vector.h
index 1acc9526..7a7e0f14 100644
--- a/engine/gamma/vector/raw_vector.h
+++ b/engine/gamma/vector/raw_vector.h
@@ -174,9 +174,9 @@ void StartFlushingIfNeed(RawVector *vec);
 void StopFlushingIfNeed(RawVector *vec);
 
 struct StoreParams {
-  int cache_size_; // M bytes
+  long cache_size_; // bytes
 
-  StoreParams() { cache_size_ = 1024 * 2; }
+  StoreParams() { cache_size_ = -1; }
   StoreParams(const StoreParams &other) {
     this->cache_size_ = other.cache_size_;
   }
diff --git a/engine/gamma/vector/raw_vector_factory.h b/engine/gamma/vector/raw_vector_factory.h
index 4f7eaaa4..b95769d3 100644
--- a/engine/gamma/vector/raw_vector_factory.h
+++ b/engine/gamma/vector/raw_vector_factory.h
@@ -15,6 +15,7 @@
 #include "rocksdb_raw_vector.h"
 #endif // WITH_ROCKSDB
 
+#include "gamma_common_data.h"
 #include <string>
 
 namespace tig_gamma {
@@ -28,6 +29,8 @@ class RawVectorFactory {
     StoreParams store_params;
     if (store_param != "" && store_params.Parse(store_param.c_str()))
       return nullptr;
+    if (store_params.cache_size_ == -1)
+      store_params.cache_size_ = max_doc_size * dimension * sizeof(float);
     LOG(INFO) << "store parameters=" << store_params.ToString();
     switch (type) {
     case Mmap:
diff --git a/engine/gamma/vector/rocksdb_raw_vector.cc b/engine/gamma/vector/rocksdb_raw_vector.cc
index 82789d6c..d57c7f7b 100644
--- a/engine/gamma/vector/rocksdb_raw_vector.cc
+++ b/engine/gamma/vector/rocksdb_raw_vector.cc
@@ -41,7 +41,7 @@ RocksDBRawVector::~RocksDBRawVector() {
 }
 
 int RocksDBRawVector::Init() {
-  block_cache_size_ = store_params_->cache_size_ * 1024 * 1024;
+  block_cache_size_ = store_params_->cache_size_;
 
   raw_vector_io_ = new RawVectorIO(this);
   if (raw_vector_io_->Init(true)) {
diff --git a/engine/gamma/vector/vector_buffer_queue.cc b/engine/gamma/vector/vector_buffer_queue.cc
index 5cb3f011..09f6041b 100644
--- a/engine/gamma/vector/vector_buffer_queue.cc
+++ b/engine/gamma/vector/vector_buffer_queue.cc
@@ -50,6 +50,13 @@ int VectorBufferQueue::Init(string &fet_file_path) {
   if (dimension_ <= 0) {
     return 1;
   }
+  if (max_vector_size_ % chunk_num_ != 0) {
+    LOG(ERROR) << "max_vector_size(" << max_vector_size_ << ") % chunk_num("
+               << chunk_num_ << ") != 0";
+    return 1;
+  }
+  chunk_size_ = max_vector_size_ / chunk_num_;
+
   vector_byte_size_ = sizeof(float) * dimension_;
   buffer_ = (float *)calloc(max_vector_size_, vector_byte_size_);
   if (buffer_ == NULL) {
@@ -90,12 +97,6 @@ int VectorBufferQueue::Init(string &fet_file_path) {
     pop_index_ = push_index_;
   }
 
-  if (max_vector_size_ % chunk_num_ != 0) {
-    LOG(ERROR) << "max_vector_size_ % chunk_num_ != 0";
-    return 1;
-  }
-  chunk_size_ = max_vector_size_ / chunk_num_;
-
   shared_mutexes_ = new pthread_rwlock_t[chunk_num_];
   for (int i = 0; i < chunk_num_; i++) {
     int ret = pthread_rwlock_init(&shared_mutexes_[i], NULL);
@@ -107,6 +108,7 @@ int VectorBufferQueue::Init(string &fet_file_path) {
   LOG(INFO) << "vector buffer queue init success! buffer byte size="
             << (long)max_vector_size_ * vector_byte_size_
             << ", buffer vector size=" << max_vector_size_
+            << ", chunk number=" << chunk_num_
             << ", stored number=" << stored_num_;
   return 0;
 }
diff --git a/engine/gamma/vector/vector_manager.cc b/engine/gamma/vector/vector_manager.cc
index dcd18ea6..c63834cb 100644
--- a/engine/gamma/vector/vector_manager.cc
+++ b/engine/gamma/vector/vector_manager.cc
@@ -18,9 +18,9 @@ static bool InnerProductCmp(const VectorDoc &a, const VectorDoc &b) {
   return a.score > b.score;
 }
 
-static bool L2Cmp(const VectorDoc &a, const VectorDoc &b) {
-  return a.score < b.score;
-}
+// static bool L2Cmp(const VectorDoc &a, const VectorDoc &b) {
+//   return a.score < b.score;
+// }
 
 static ByteArray *CopyByteArray(ByteArray *ba) {
   return MakeByteArray(ba->value, ba->len);
@@ -233,7 +233,8 @@ int VectorManager::Search(const GammaQuery &query, GammaResult *results) {
       return -1;
     }
 
-    n = query.vec_query[i]->value->len / (sizeof(float) * iter->second->d_);
+    int d = iter->second->raw_vec_->GetDimension();
+    n = query.vec_query[i]->value->len / (sizeof(float) * d);
     if (!all_vector_results[i].init(n, query.condition->topn)) {
       LOG(ERROR) << "Query name " << name << "init vector result error";
       return -1;