diff --git a/demo-client/src/bert_service.cpp b/demo-client/src/bert_service.cpp
index 59daad75069e1ed4b8a85006d5b137aaf55de105..1910b18421bf99d4b4f1e197fcbaf9d07cb52976 100644
--- a/demo-client/src/bert_service.cpp
+++ b/demo-client/src/bert_service.cpp
@@ -93,9 +93,9 @@ int create_req(Request* req,
         ins->add_input_masks(0.0);
       }
     }
-    ins->set_max_seq_len(max_seq_len);
-    ins->set_emb_size(emb_size);
   }
+  req->set_max_seq_len(max_seq_len);
+  req->set_emb_size(emb_size);
   return 0;
 }
 
diff --git a/demo-serving/op/bert_service_op.cpp b/demo-serving/op/bert_service_op.cpp
index 6791d4b9ec46e2a5ece0ab585225aea5f909e75c..831ab855c5004238994528462b3402d820847419 100644
--- a/demo-serving/op/bert_service_op.cpp
+++ b/demo-serving/op/bert_service_op.cpp
@@ -28,6 +28,21 @@ using baidu::paddle_serving::predictor::bert_service::BertReqInstance;
 using baidu::paddle_serving::predictor::bert_service::Request;
 using baidu::paddle_serving::predictor::bert_service::EmbeddingValues;
 
+std::vector<std::string> split(const std::string &str,
+                               const std::string &pattern) {
+  std::vector<std::string> res;
+  if (str == "") return res;
+  std::string strs = str + pattern;
+  size_t pos = strs.find(pattern);
+  while (pos != strs.npos) {
+    std::string temp = strs.substr(0, pos);
+    res.push_back(temp);
+    strs = strs.substr(pos + 1, strs.size());
+    pos = strs.find(pattern);
+  }
+  return res;
+}
+
 int BertServiceOp::inference() {
   timeval op_start;
   gettimeofday(&op_start, NULL);
@@ -43,17 +58,27 @@ int BertServiceOp::inference() {
     return 0;
   }
 
-  const int64_t MAX_SEQ_LEN = req->instances(0).max_seq_len();
-  const int64_t EMB_SIZE = req->instances(0).emb_size();
+  const int64_t MAX_SEQ_LEN = req->max_seq_len();
+  const int64_t EMB_SIZE = req->emb_size();
 
   paddle::PaddleTensor src_ids;
   paddle::PaddleTensor pos_ids;
   paddle::PaddleTensor seg_ids;
   paddle::PaddleTensor input_masks;
-  src_ids.name = std::string("src_ids");
-  pos_ids.name = std::string("pos_ids");
-  seg_ids.name = std::string("sent_ids");
-  input_masks.name = std::string("input_mask");
+
+  if (req->has_feed_var_names()) {
+    // support paddlehub model
+    std::vector<std::string> feed_list = split(req->feed_var_names(), ";");
+    src_ids.name = feed_list[0];
+    pos_ids.name = feed_list[1];
+    seg_ids.name = feed_list[2];
+    input_masks.name = feed_list[3];
+  } else {
+    src_ids.name = std::string("src_ids");
+    pos_ids.name = std::string("pos_ids");
+    seg_ids.name = std::string("sent_ids");
+    input_masks.name = std::string("input_mask");
+  }
 
   src_ids.dtype = paddle::PaddleDType::INT64;
   src_ids.shape = {batch_size, MAX_SEQ_LEN, 1};
diff --git a/demo-serving/proto/bert_service.proto b/demo-serving/proto/bert_service.proto
index 73ee7ed4958cc26777097fc16ee2f4dbb6c06879..8b19c5efc683a6fa4447e00cd4700b771102a0d5 100644
--- a/demo-serving/proto/bert_service.proto
+++ b/demo-serving/proto/bert_service.proto
@@ -25,11 +25,15 @@ message BertReqInstance {
   repeated int64 sentence_type_ids = 2;
   repeated int64 position_ids = 3;
   repeated float input_masks = 4;
-  optional int64 max_seq_len = 5;
-  optional int64 emb_size = 6;
 };
 
-message Request { repeated BertReqInstance instances = 1; };
+message Request {
+  repeated BertReqInstance instances = 1;
+  optional int64 max_seq_len = 2;
+  optional int64 emb_size = 3;
+  optional string feed_var_names = 4;
+  optional string fetch_var_names = 5;
+};
 
 message EmbeddingValues { repeated float values = 1; };
 
diff --git a/sdk-cpp/proto/bert_service.proto b/sdk-cpp/proto/bert_service.proto
index 693386afb188ebfc9631e9102a2a7eb27223851e..e12e7674343bc25379cf9ca65ebde4e7775af028 100644
--- a/sdk-cpp/proto/bert_service.proto
+++ b/sdk-cpp/proto/bert_service.proto
@@ -25,11 +25,15 @@ message BertReqInstance {
   repeated int64 sentence_type_ids = 2;
   repeated int64 position_ids = 3;
   repeated float input_masks = 4;
-  optional int64 max_seq_len = 5;
-  optional int64 emb_size = 6;
 };
 
-message Request { repeated BertReqInstance instances = 1; };
+message Request {
+  repeated BertReqInstance instances = 1;
+  optional int64 max_seq_len = 2;
+  optional int64 emb_size = 3;
+  optional string feed_var_names = 4;
+  optional string fetch_var_names = 5;
+};
 
 message EmbeddingValues { repeated float values = 1; };