diff --git a/core/general-server/op/general_dist_kv_infer_op.cpp b/core/general-server/op/general_dist_kv_infer_op.cpp
index 2228ccb952b1a91a5e34f990ae4c186570b91f5d..8ee5033d976284b149a2a8bde4e64deea636311f 100644
--- a/core/general-server/op/general_dist_kv_infer_op.cpp
+++ b/core/general-server/op/general_dist_kv_infer_op.cpp
@@ -70,10 +70,13 @@ int GeneralDistKVInferOp::inference() {
                << ") Failed mutable depended argument, op:" << pre_name;
     return -1;
   }
-
+  Timer timeline;
+  timeline.Start();
   const TensorVector *in = &input_blob->tensor_vector;
   TensorVector *out = &output_blob->tensor_vector;
   std::vector<uint64_t> keys;
+  std::vector<uint64_t> unique_keys;
+  std::unordered_map<uint64_t, rec::mcube::CubeValue*> key_map;
   std::vector<rec::mcube::CubeValue> values;
   int sparse_count = 0; // sparse inputs counts, sparse would seek cube
   int dense_count = 0; // dense inputs counts, dense would directly call paddle infer
@@ -94,7 +97,8 @@ int GeneralDistKVInferOp::inference() {
     dataptr_size_pairs.push_back(std::make_pair(data_ptr, elem_num));
   }
   keys.resize(key_len);
-  VLOG(3) << "(logid=" << log_id << ") cube number of keys to look up: " << key_len;
+  unique_keys.resize(key_len);
+
   int key_idx = 0;
   for (size_t i = 0; i < dataptr_size_pairs.size(); ++i) {
     std::copy(dataptr_size_pairs[i].first,
@@ -102,20 +106,35 @@ int GeneralDistKVInferOp::inference() {
               keys.begin() + key_idx);
     key_idx += dataptr_size_pairs[i].second;
   }
+
+  int unique_keys_count = 0;
+  for (size_t i = 0; i < keys.size(); ++i) {
+    if (key_map.find(keys[i]) == key_map.end()) {
+       key_map[keys[i]] = nullptr;
+       unique_keys[unique_keys_count++] = keys[i];
+    }
+  }
+  unique_keys.resize(unique_keys_count);
+  VLOG(1) << "(logid=" << log_id << ") cube number of keys to look up: " << key_len << " uniq keys: "<< unique_keys_count;
   rec::mcube::CubeAPI *cube = rec::mcube::CubeAPI::instance();
   std::vector<std::string> table_names = cube->get_table_names();
   if (table_names.size() == 0) {
     LOG(ERROR) << "cube init error or cube config not given.";
     return -1;
   }
-  // gather keys and seek cube servers, put results in values 
-  int ret = cube->seek(table_names[0], keys, &values);
-  VLOG(3) << "(logid=" << log_id << ") cube seek status: " << ret;
+
+  int64_t seek_start = timeline.TimeStampUS();
+  int ret = cube->seek(table_names[0], unique_keys, &values);
+  int64_t seek_end = timeline.TimeStampUS();
+  VLOG(2) << "(logid=" << log_id << ") cube seek status: " << ret << " seek_time: " << seek_end - seek_start;
+  for (size_t i = 0; i < unique_keys.size(); ++i) {  
+    key_map[unique_keys[i]] = &values[i];   
+  }
   if (values.size() != keys.size() || values[0].buff.size() == 0) {
     LOG(ERROR) << "cube value return null";
   }
-  // EMBEDDING_SIZE means the length of sparse vector, user can define length here. 
-  size_t EMBEDDING_SIZE = values[0].buff.size() / sizeof(float);
+  //size_t EMBEDDING_SIZE = values[0].buff.size() / sizeof(float);
+  size_t EMBEDDING_SIZE = (values[0].buff.size() - 10) / sizeof(float);
   TensorVector sparse_out;
   sparse_out.resize(sparse_count);
   TensorVector dense_out;
@@ -127,7 +146,9 @@ int GeneralDistKVInferOp::inference() {
   baidu::paddle_serving::predictor::Resource &resource =
       baidu::paddle_serving::predictor::Resource::instance();
   std::shared_ptr<PaddleGeneralModelConfig> model_config = resource.get_general_model_config().front();
-  //copy data to tnsor
+  int cube_key_found = 0;
+  int cube_key_miss = 0; 
+
   for (size_t i = 0; i < in->size(); ++i) {
     if (in->at(i).dtype != paddle::PaddleDType::INT64) {
       dense_out[dense_idx] = in->at(i);
@@ -150,20 +171,39 @@ int GeneralDistKVInferOp::inference() {
     float *dst_ptr = static_cast<float *>(sparse_out[sparse_idx].data.data());
     for (int x = 0; x < sparse_out[sparse_idx].lod[0].back(); ++x) {
       float *data_ptr = dst_ptr + x * EMBEDDING_SIZE;
-      memcpy(data_ptr,
-             values[cube_val_idx].buff.data(),
-             values[cube_val_idx].buff.size());
-      cube_val_idx++;
+      uint64_t cur_key = keys[cube_val_idx];
+      rec::mcube::CubeValue* cur_val = key_map[cur_key];
+      if (cur_val->buff.size() == 0) {
+         memset(data_ptr, (float)0.0, sizeof(float) * EMBEDDING_SIZE);
+         VLOG(3) << "(logid=" << log_id << ") cube key not found: " << keys[cube_val_idx];
+         ++cube_key_miss;
+	 ++cube_val_idx;
+         continue;
+      }
+      VLOG(2) << "(logid=" << log_id << ") key: " << keys[cube_val_idx]  << " , cube value len:" << cur_val->buff.size();
+      memcpy(data_ptr, cur_val->buff.data(), cur_val->buff.size());
+      //VLOG(3) <<  keys[cube_val_idx] << ":" << data_ptr[0] << ", " << data_ptr[1] << ", " <<data_ptr[2] << ", " <<data_ptr[3] << ", " <<data_ptr[4] << ", " <<data_ptr[5] << ", " <<data_ptr[6] << ", " <<data_ptr[7] << ", " <<data_ptr[8];
+      ++cube_key_found;
+      ++cube_val_idx;
     }
     ++sparse_idx;
   }
-  VLOG(3) << "(logid=" << log_id << ") sparse tensor load success.";
+  bool cube_fail = (cube_key_found == 0);
+  if (cube_fail) {
+    LOG(WARNING) << "(logid=" << log_id << ") cube seek fail";
+    //CopyBlobInfo(input_blob, output_blob);
+    //return 0;
+  }
+  VLOG(2) << "(logid=" << log_id << ") cube key found: " << cube_key_found << " , cube key miss: " << cube_key_miss;
+  VLOG(2) << "(logid=" << log_id << ") sparse tensor load success.";
+  timeline.Pause();
+  VLOG(2) << "dist kv, cube and datacopy time: " << timeline.ElapsedUS();
+
   TensorVector infer_in;
   infer_in.insert(infer_in.end(), dense_out.begin(), dense_out.end());
   infer_in.insert(infer_in.end(), sparse_out.begin(), sparse_out.end());
   int batch_size = input_blob->_batch_size;
   output_blob->_batch_size = batch_size;
-  Timer timeline;
   int64_t start = timeline.TimeStampUS();
   timeline.Start();
   // call paddle inference here
@@ -173,7 +213,12 @@ int GeneralDistKVInferOp::inference() {
     return -1;
   }
   int64_t end = timeline.TimeStampUS();
-
+  if (cube_fail) { 
+     float *out_ptr = static_cast<float*>(out->at(0).data.data());
+     out_ptr[0] = 0.0;
+  }
+  timeline.Pause();
+  VLOG(2) << "dist kv, pure paddle infer time: " << timeline.ElapsedUS(); 
   CopyBlobInfo(input_blob, output_blob);
   AddBlobInfo(output_blob, start);
   AddBlobInfo(output_blob, end);