diff --git a/python/examples/bert/bert_web_service.py b/python/examples/bert/bert_web_service.py
index f72694c0e8c5bb7ab2778278d3fc79f13516dc12..8db64e5eb792a7365ed739bbfb05bf38fd8a0da1 100644
--- a/python/examples/bert/bert_web_service.py
+++ b/python/examples/bert/bert_web_service.py
@@ -24,7 +24,9 @@ class BertService(WebService):
         self.reader = BertReader(vocab_file="vocab.txt", max_seq_len=128)
 
     def preprocess(self, feed={}, fetch=[]):
-        feed_res = self.reader.process(feed["words"].encode("utf-8"))
+        feed_res = [{
+            "words": self.reader.process(ins["words"].encode("utf-8"))
+        } for ins in feed]
         return feed_res, fetch
 
 
diff --git a/python/examples/imagenet/image_classification_service.py b/python/examples/imagenet/image_classification_service.py
index a041d9d9447184512f010251c85c919985f02c7c..81169d6bdafa7024f2b997c48c0abdc04411e391 100644
--- a/python/examples/imagenet/image_classification_service.py
+++ b/python/examples/imagenet/image_classification_service.py
@@ -23,23 +23,14 @@ from paddle_serving_app import ImageReader
 class ImageService(WebService):
     def preprocess(self, feed={}, fetch=[]):
         reader = ImageReader()
-        if "image" not in feed:
-            raise ("feed data error!")
-        if isinstance(feed["image"], list):
-            feed_batch = []
-            for image in feed["image"]:
-                sample = base64.b64decode(image)
-                img = reader.process_image(sample)
-                res_feed = {}
-                res_feed["image"] = img
-                feed_batch.append(res_feed)
-            return feed_batch, fetch
-        else:
-            sample = base64.b64decode(feed["image"])
+        feed_batch = []
+        for ins in feed:
+            if "image" not in ins:
+                raise ("feed data error!")
+            sample = base64.b64decode(ins["image"])
             img = reader.process_image(sample)
-            res_feed = {}
-            res_feed["image"] = img
-            return res_feed, fetch
+            feed_batch.append({"image": img})
+        return feed_batch, fetch
 
 
 image_service = ImageService(name="image")
diff --git a/python/examples/imagenet/image_classification_service_gpu.py b/python/examples/imagenet/image_classification_service_gpu.py
index ccb2adac26bb0fd16165dd2dfb3c9507b1bf193f..7cb973547982877a50e86062fe187233a32065e6 100644
--- a/python/examples/imagenet/image_classification_service_gpu.py
+++ b/python/examples/imagenet/image_classification_service_gpu.py
@@ -23,24 +23,14 @@ from paddle_serving_server_gpu.web_service import WebService
 class ImageService(WebService):
     def preprocess(self, feed={}, fetch=[]):
         reader = ImageReader()
-        if "image" not in feed:
-            raise ("feed data error!")
-        print(type(feed["image"]), isinstance(feed["image"], list))
-        if isinstance(feed["image"], list):
-            feed_batch = []
-            for image in feed["image"]:
-                sample = base64.b64decode(image)
-                img = reader.process_image(sample)
-                res_feed = {}
-                res_feed["image"] = img
-                feed_batch.append(res_feed)
-            return feed_batch, fetch
-        else:
-            sample = base64.b64decode(feed["image"])
+        feed_batch = []
+        for ins in feed:
+            if "image" not in ins:
+                raise ("feed data error!")
+            sample = base64.b64decode(ins["image"])
             img = reader.process_image(sample)
-            res_feed = {}
-            res_feed["image"] = img
-            return res_feed, fetch
+            feed_batch.append({"image": img})
+        return feed_batch, fetch
 
 
 image_service = ImageService(name="image")
diff --git a/python/examples/imdb/benchmark_batch.py b/python/examples/imdb/benchmark_batch.py
index 57ee6816989d4a807a328342f188a7298b7772de..5891970b5decc34f35723187e44b166e0482c6e9 100644
--- a/python/examples/imdb/benchmark_batch.py
+++ b/python/examples/imdb/benchmark_batch.py
@@ -40,21 +40,29 @@ def single_func(idx, resource):
             if args.batch_size >= 1:
                 feed_batch = []
                 for bi in range(args.batch_size):
-                    word_ids, label = imdb_dataset.get_words_and_label(line)
+                    word_ids, label = imdb_dataset.get_words_and_label(dataset[
+                        bi])
                     feed_batch.append({"words": word_ids})
                 result = client.predict(feed=feed_batch, fetch=["prediction"])
+                if result is None:
+                    raise ("predict failed.")
             else:
                 print("unsupport batch size {}".format(args.batch_size))
 
     elif args.request == "http":
-        for fn in filelist:
-            fin = open(fn)
-            for line in fin:
-                word_ids, label = imdb_dataset.get_words_and_label(line)
-                r = requests.post(
-                    "http://{}/imdb/prediction".format(args.endpoint),
-                    data={"words": word_ids,
-                          "fetch": ["prediction"]})
+        if args.batch_size >= 1:
+            feed_batch = []
+            for bi in range(args.batch_size):
+                feed_batch.append({"words": dataset[bi]})
+            r = requests.post(
+                "http://{}/imdb/prediction".format(args.endpoint),
+                json={"feed": feed_batch,
+                      "fetch": ["prediction"]})
+            if r.status_code != 200:
+                print('HTTP status code -ne 200')
+                raise ("predict failed.")
+        else:
+            print("unsupport batch size {}".format(args.batch_size))
     end = time.time()
     return [[end - start]]
 
diff --git a/python/examples/imdb/benchmark_batch.sh b/python/examples/imdb/benchmark_batch.sh
index 322aaafffb9b252a307fcb63dc7b910e33e5e002..15b65338b21675fd89056cf32f9a247b385a6a36 100644
--- a/python/examples/imdb/benchmark_batch.sh
+++ b/python/examples/imdb/benchmark_batch.sh
@@ -3,7 +3,7 @@ for thread_num in 1 2 4 8 16
 do
 for batch_size in 1 2 4 8 16 32 64 128 256 512
 do
-    $PYTHONROOT/bin/python benchmark_batch.py --thread $thread_num --batch_size $batch_size --model imdbo_bow_client_conf/serving_client_conf.prototxt --request rpc > profile 2>&1
+    $PYTHONROOT/bin/python benchmark_batch.py --thread $thread_num --batch_size $batch_size --model imdb_bow_client_conf/serving_client_conf.prototxt --request rpc > profile 2>&1
     echo "========================================"
     echo "batch size : $batch_size" >> profile_log
     $PYTHONROOT/bin/python ../util/show_profile.py profile $thread_num >> profile_log
diff --git a/python/examples/imdb/text_classify_service.py b/python/examples/imdb/text_classify_service.py
index 5ff919ebb44b9a2590b148e4ccf8b91ce85f3f53..4420a99facc7bd3db1c8bf1df0c58765467517de 100755
--- a/python/examples/imdb/text_classify_service.py
+++ b/python/examples/imdb/text_classify_service.py
@@ -26,10 +26,9 @@ class IMDBService(WebService):
         self.dataset.load_resource(args["dict_file_path"])
 
     def preprocess(self, feed={}, fetch=[]):
-        if "words" not in feed:
-            exit(-1)
-        res_feed = {}
-        res_feed["words"] = self.dataset.get_words_only(feed["words"])
+        res_feed = [{
+            "words": self.dataset.get_words_only(ins["words"])
+        } for ins in feed]
         return res_feed, fetch
 
 
diff --git a/python/examples/lac/lac_reader.py b/python/examples/lac/lac_reader.py
index 3895277dbbf98a9b4ff2d6592d82fe02fe9a4c12..c9f31c148123e1975c0102903abf2f2b3b15d3f6 100644
--- a/python/examples/lac/lac_reader.py
+++ b/python/examples/lac/lac_reader.py
@@ -108,15 +108,15 @@ class LACReader(object):
         partial_word = ""
         for ind, tag in enumerate(tags):
             if partial_word == "":
-                partial_word = words[ind]
+                partial_word = self.id2word_dict[str(words[ind])]
                 tags_out.append(tag.split('-')[0])
                 continue
             if tag.endswith("-B") or (tag == "O" and tag[ind - 1] != "O"):
                 sent_out.append(partial_word)
                 tags_out.append(tag.split('-')[0])
-                partial_word = words[ind]
+                partial_word = self.id2word_dict[str(words[ind])]
                 continue
-            partial_word += words[ind]
+            partial_word += self.id2word_dict[str(words[ind])]
 
         if len(sent_out) < len(tags_out):
             sent_out.append(partial_word)
diff --git a/python/examples/lac/lac_web_service.py b/python/examples/lac/lac_web_service.py
index 186d8badf8806606998466e3d1bb4047bf51b5d8..c9bd00986c62abde3ee24ddddbf08dda45bbed05 100644
--- a/python/examples/lac/lac_web_service.py
+++ b/python/examples/lac/lac_web_service.py
@@ -22,15 +22,24 @@ class LACService(WebService):
         self.reader = LACReader("lac_dict")
 
     def preprocess(self, feed={}, fetch=[]):
-        if "words" not in feed:
-            raise ("feed data error!")
-        feed_data = self.reader.process(feed["words"])
+        feed_batch = []
+        for ins in feed:
+            if "words" not in ins:
+                raise ("feed data error!")
+            feed_data = self.reader.process(ins["words"])
+            feed_batch.append({"words": feed_data})
         fetch = ["crf_decode"]
-        return {"words": feed_data}, fetch
+        return feed_batch, fetch
 
     def postprocess(self, feed={}, fetch=[], fetch_map={}):
-        segs = self.reader.parse_result(feed["words"], fetch_map["crf_decode"])
-        return {"word_seg": "|".join(segs)}
+        batch_ret = []
+        for idx, ins in enumerate(feed):
+            begin = fetch_map['crf_decode.lod'][idx]
+            end = fetch_map['crf_decode.lod'][idx + 1]
+            segs = self.reader.parse_result(ins["words"],
+                                            fetch_map["crf_decode"][begin:end])
+            batch_ret.append({"word_seg": "|".join(segs)})
+        return batch_ret
 
 
 lac_service = LACService(name="lac")
@@ -39,3 +48,4 @@ lac_service.load_reader()
 lac_service.prepare_server(
     workdir=sys.argv[2], port=int(sys.argv[3]), device="cpu")
 lac_service.run_server()
+lac_service.run_flask()
diff --git a/python/examples/senta/senta_web_service.py b/python/examples/senta/senta_web_service.py
index 35dab1911ec18af55ef19750b1b239b5aba2c8a9..9a59d9d030ae55584f1b9939a02c782bae3c5011 100644
--- a/python/examples/senta/senta_web_service.py
+++ b/python/examples/senta/senta_web_service.py
@@ -87,7 +87,7 @@ class SentaService(WebService):
         if self.show:
             print("---- senta reader ----")
             print("feed_data", feed_data)
-        return {"words": feed_data}, fetch
+        return [{"words": feed_data}], fetch
 
 
 senta_service = SentaService(name="senta")
diff --git a/tools/serving_build.sh b/tools/serving_build.sh
index a39e5a63f91ba694a20973bba9e3fe440446be20..a522efe19cb9f4170341f291d8c30db0e6749ad1 100644
--- a/tools/serving_build.sh
+++ b/tools/serving_build.sh
@@ -157,12 +157,20 @@ function python_test_fit_a_line() {
             check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"x\": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], \"fetch\":[\"price\"]}' http://127.0.0.1:9393/uci/prediction"
             # check http code
             http_code=`curl -H "Content-Type:application/json" -X POST -d '{"feed":[{"x": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], "fetch":["price"]}' -s -w "%{http_code}" -o /dev/null http://127.0.0.1:9393/uci/prediction`
-            setproxy # recover proxy state
-            kill_server_process
             if [ ${http_code} -ne 200 ]; then
                 echo "HTTP status code -ne 200"
                 exit 1
             fi
+            # test web batch
+            check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"x\": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}, {\"x\": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], \"fetch\":[\"price\"]}' http://127.0.0.1:9393/uci/prediction"
+            # check http code
+            http_code=`curl -H "Content-Type:application/json" -X POST -d '{"feed":[{"x": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}, {"x": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], "fetch":["price"]}' -s -w "%{http_code}" -o /dev/null http://127.0.0.1:9393/uci/prediction`
+            if [ ${http_code} -ne 200 ]; then
+                echo "HTTP status code -ne 200"
+                exit 1
+            fi
+            setproxy # recover proxy state
+            kill_server_process
             ;;
         GPU)
             export CUDA_VISIBLE_DEVICES=0
@@ -179,12 +187,20 @@ function python_test_fit_a_line() {
             check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"x\": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], \"fetch\":[\"price\"]}' http://127.0.0.1:9393/uci/prediction"
             # check http code
             http_code=`curl -H "Content-Type:application/json" -X POST -d '{"feed":[{"x": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], "fetch":["price"]}' -s -w "%{http_code}" -o /dev/null http://127.0.0.1:9393/uci/prediction`
-            setproxy # recover proxy state
-            kill_server_process
             if [ ${http_code} -ne 200 ]; then
                 echo "HTTP status code -ne 200"
                 exit 1
             fi
+            # test web batch
+            check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"x\": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}, {\"x\": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], \"fetch\":[\"price\"]}' http://127.0.0.1:9393/uci/prediction"
+            # check http code
+            http_code=`curl -H "Content-Type:application/json" -X POST -d '{"feed":[{"x": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}, {"x": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332]}], "fetch":["price"]}' -s -w "%{http_code}" -o /dev/null http://127.0.0.1:9393/uci/prediction`
+            if [ ${http_code} -ne 200 ]; then
+                echo "HTTP status code -ne 200"
+                exit 1
+            fi
+            setproxy # recover proxy state
+            kill_server_process
             ;;
         *)
             echo "error type"
@@ -288,15 +304,6 @@ function python_test_bert() {
             pip install paddle_serving_app
             check_cmd "head -n 10 data-c.txt | python bert_client.py --model bert_chinese_L-12_H-768_A-12_client/serving_client_conf.prototxt"
             kill_server_process
-            # python prepare_model.py 20
-            # sh get_data.sh
-            # check_cmd "python -m paddle_serving_server.serve --model bert_seq20_model/ --port 9292 &"
-            # sleep 5
-            # pip install paddle_serving_app
-            # check_cmd "head -n 10 data-c.txt | python bert_client.py --model bert_seq20_client/serving_client_conf.prototxt"
-            # kill_server_process
-            # ps -ef | grep "paddle_serving_server" | grep -v grep | awk '{print $2}' | xargs kill
-            # ps -ef | grep "serving" | grep -v grep | awk '{print $2}' | xargs kill
             echo "bert RPC inference pass"
             ;;
         GPU)
@@ -312,14 +319,6 @@ function python_test_bert() {
             pip install paddle_serving_app
             check_cmd "head -n 10 data-c.txt | python bert_client.py --model bert_chinese_L-12_H-768_A-12_client/serving_client_conf.prototxt"
             kill_server_process
-            # python prepare_model.py 20
-            # sh get_data.sh
-            # check_cmd "python -m paddle_serving_server_gpu.serve --model bert_seq20_model/ --port 9292 --gpu_ids 0 &"
-            # sleep 5
-            # pip install paddle_serving_app
-            # check_cmd "head -n 10 data-c.txt | python bert_client.py --model bert_seq20_client/serving_client_conf.prototxt"
-            # kill_server_process
-            # ps -ef | grep "paddle_serving_server" | grep -v grep | awk '{print $2}' | xargs kill
             echo "bert RPC inference pass"
             ;;
         *)
@@ -340,19 +339,29 @@ function python_test_imdb() {
     case $TYPE in
         CPU)
             sh get_data.sh
-            sleep 5
             check_cmd "python -m paddle_serving_server.serve --model imdb_cnn_model/ --port 9292 &"
+            sleep 5
             check_cmd "head test_data/part-0 | python test_client.py imdb_cnn_client_conf/serving_client_conf.prototxt imdb.vocab"
+            # test batch predict
+            check_cmd "python benchmark_batch.py --thread 4 --batch_size 8 --model imdb_bow_client_conf/serving_client_conf.prototxt --request rpc --endpoint 127.0.0.1:9292"
             echo "imdb CPU RPC inference pass"
-            ps -ef | grep "paddle_serving_server" | grep -v grep | awk '{print $2}' | xargs kill
+            kill_server_process
             rm -rf work_dir1
             sleep 5
 
-            check_cmd "python text_classify_service.py imdb_cnn_model/workdir/9292 imdb.vocab &"
+            unsetproxy # maybe the proxy is used on iPipe, which makes web-test failed.
+            check_cmd "python text_classify_service.py imdb_cnn_model/ workdir/ 9292 imdb.vocab &"
             sleep 5
             check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"words\": \"i am very sad | 0\"}], \"fetch\":[\"prediction\"]}' http://127.0.0.1:9292/imdb/prediction"
+            http_code=`curl -H "Content-Type:application/json" -X POST -d '{"feed":[{"words": "i am very sad | 0"}], "fetch":["prediction"]}' -s -w "%{http_code}" -o /dev/null http://127.0.0.1:9292/imdb/prediction`
+            if [ ${http_code} -ne 200 ]; then
+                echo "HTTP status code -ne 200"
+                exit 1
+            fi
+            # test batch predict
+            check_cmd "python benchmark_batch.py --thread 4 --batch_size 8 --model imdb_bow_client_conf/serving_client_conf.prototxt --request http --endpoint 127.0.0.1:9292"
+            setproxy # recover proxy state
             kill_server_process
-            ps -ef | grep "paddle_serving_server" | grep -v grep | awk '{print $2}' | xargs kill
             ps -ef | grep "text_classify_service.py" | grep -v grep | awk '{print $2}' | xargs kill
             echo "imdb CPU HTTP inference pass"
             ;;
@@ -379,15 +388,30 @@ function python_test_lac() {
             sh get_data.sh
             check_cmd "python -m paddle_serving_server.serve --model jieba_server_model/ --port 9292 &"
             sleep 5
-            check_cmd "echo "我爱北京天安门" | python lac_client.py jieba_client_conf/serving_client_conf.prototxt lac_dict/"
+            check_cmd "echo \"我爱北京天安门\" | python lac_client.py jieba_client_conf/serving_client_conf.prototxt lac_dict/"
             echo "lac CPU RPC inference pass"
-            ps -ef | grep "paddle_serving_server" | grep -v grep | awk '{print $2}' | xargs kill
+            kill_server_process
 
+            unsetproxy # maybe the proxy is used on iPipe, which makes web-test failed.
             check_cmd "python lac_web_service.py jieba_server_model/ lac_workdir 9292 &"
             sleep 5
-            check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"words\": \"i am very sad | 0\"}], \"fetch\":[\"prediction\"]}' http://127.0.0.1:9292/imdb/prediction"
+            check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"words\": \"我爱北京天安门\"}], \"fetch\":[\"word_seg\"]}' http://127.0.0.1:9292/lac/prediction"
+            # check http code
+            http_code=`curl -H "Content-Type:application/json" -X POST -d '{"feed":[{"words": "我爱北京天安门"}], "fetch":["word_seg"]}' -s -w "%{http_code}" -o /dev/null http://127.0.0.1:9292/lac/prediction`
+            if [ ${http_code} -ne 200 ]; then
+                echo "HTTP status code -ne 200"
+                exit 1
+            fi
+            # http batch
+            check_cmd "curl -H \"Content-Type:application/json\" -X POST -d '{\"feed\":[{\"words\": \"我爱北京天安门\"}, {\"words\": \"我爱北京天安门\"}], \"fetch\":[\"word_seg\"]}' http://127.0.0.1:9292/lac/prediction"
+            # check http code
+            http_code=`curl -H "Content-Type:application/json" -X POST -d '{"feed":[{"words": "我爱北京天安门"}, {"words": "我爱北京天安门"}], "fetch":["word_seg"]}' -s -w "%{http_code}" -o /dev/null http://127.0.0.1:9292/lac/prediction`
+            if [ ${http_code} -ne 200 ]; then
+                echo "HTTP status code -ne 200"
+                exit 1
+            fi
+            setproxy # recover proxy state
             kill_server_process
-            ps -ef | grep "paddle_serving_server" | grep -v grep | awk '{print $2}' | xargs kill
             ps -ef | grep "lac_web_service" | grep -v grep | awk '{print $2}' | xargs kill
             echo "lac CPU HTTP inference pass"
             ;;