diff --git a/python/paddle/fluid/contrib/int8_inference/utility.py b/python/paddle/fluid/contrib/int8_inference/utility.py
index 197fc5f2d261798dc17daa37c1b6d258936a8a39..40de038f28a83738e6e6cd8c77c0a9916ce68b4f 100644
--- a/python/paddle/fluid/contrib/int8_inference/utility.py
+++ b/python/paddle/fluid/contrib/int8_inference/utility.py
@@ -32,10 +32,13 @@ class Calibrator(object):
 
     def __init__(self, *args, **kwargs):
         self.program = kwargs['program']
-        self.iterations = kwargs['iterations']
         self.pretrained_model = kwargs['pretrained_model']
-        self.debug = kwargs['debug']
+        self.debug = kwargs['debug'] if 'debug' in kwargs else False
         self.algo = kwargs['algo']
+        self.output = kwargs['output']
+        self.feed_var_names = kwargs['feed_var_names']
+        self.fetch_list = kwargs['fetch_list']
+        self.exe = kwargs['exe']
 
         self._conv_input_var_name = []
         self._conv_output_var_name = []
@@ -54,17 +57,38 @@ class Calibrator(object):
         self._u8_output_var = []
         self._s8_output_var = []
         self._persistable_vars = []
+        self._sampling_data = {}
 
-    def generate_sampling_program(self):
         self.__init_analysis()
         self.__generate_output_program()
 
-    def generate_quantized_data(self, sampling_data):
-        self.__sampling(sampling_data)
+    def save_int8_model(self):
+        self.__sampling(self._sampling_data)
         self.__save_scale()
         self.__update_program()
         self.__update_output_program_attr()
         self.__display_debug()
+        self.__save_offline_model()
+
+    def sample_data(self):
+        '''
+        Sampling the tensor data of variable.
+        '''
+        for i in self.sampling_program.list_vars():
+            if i.name in self.sampling_vars:
+                np_data = np.array(fluid.global_scope().find_var(i.name)
+                                   .get_tensor())
+                if i.name not in self._sampling_data:
+                    self._sampling_data[i.name] = []
+                self._sampling_data[i.name].append(np_data)
+
+    def __save_offline_model(self):
+        '''
+        Save the quantized model to the disk.
+        '''
+        fluid.io.save_inference_model(self.output, self.feed_var_names,
+                                      self.fetch_list, self.exe,
+                                      self.sampling_program)
 
     def __display_debug(self):
         if self.debug:
diff --git a/python/paddle/fluid/contrib/tests/test_calibration.py b/python/paddle/fluid/contrib/tests/test_calibration.py
index 17e4eb8b831268bed00736db2e9706aece9fdd74..ed5ea70260878ee27606dfcd0880e442b48525c1 100644
--- a/python/paddle/fluid/contrib/tests/test_calibration.py
+++ b/python/paddle/fluid/contrib/tests/test_calibration.py
@@ -26,7 +26,7 @@ import paddle.fluid.profiler as profiler
 from PIL import Image, ImageEnhance
 import math
 sys.path.append('..')
-import int8_inference.utility as ut
+import int8_inference.utility as int8_utility
 
 random.seed(0)
 np.random.seed(0)
@@ -120,13 +120,13 @@ class TestCalibration(unittest.TestCase):
     def setUp(self):
         # TODO(guomingz): Put the download process in the cmake.
         # Download and unzip test data set
-        imagenet_dl_url = 'http://paddle-inference-dist.bj.bcebos.com/int8/calibration_test_data.tar.gz'
+        imagenet_dl_url = 'http://paddle-inference-dist.cdn.bcebos.com/int8/calibration_test_data.tar.gz'
         zip_file_name = imagenet_dl_url.split('/')[-1]
         cmd = 'rm -rf data {}  && mkdir data && wget {} && tar xvf {} -C data'.format(
             zip_file_name, imagenet_dl_url, zip_file_name)
         os.system(cmd)
         # resnet50 fp32 data
-        resnet50_fp32_model_url = 'http://paddle-inference-dist.bj.bcebos.com/int8/resnet50_int8_model.tar.gz'
+        resnet50_fp32_model_url = 'http://paddle-inference-dist.cdn.bcebos.com/int8/resnet50_int8_model.tar.gz'
         resnet50_zip_name = resnet50_fp32_model_url.split('/')[-1]
         resnet50_unzip_folder_name = 'resnet50_fp32'
         cmd = 'rm -rf {} {} && mkdir {} && wget {} && tar xvf {} -C {}'.format(
@@ -135,8 +135,7 @@ class TestCalibration(unittest.TestCase):
             resnet50_zip_name, resnet50_unzip_folder_name)
         os.system(cmd)
 
-        self.iterations = 100
-        self.skip_batch_num = 5
+        self.iterations = 50
 
     def run_program(self, model_path, generate_int8=False, algo='direct'):
         image_shape = [3, 224, 224]
@@ -163,16 +162,15 @@ class TestCalibration(unittest.TestCase):
 
             print("Start calibration ...")
 
-            calibrator = ut.Calibrator(
+            calibrator = int8_utility.Calibrator(
                 program=infer_program,
                 pretrained_model=model_path,
-                iterations=100,
-                debug=False,
-                algo=algo)
-
-            sampling_data = {}
+                algo=algo,
+                exe=exe,
+                output=int8_model,
+                feed_var_names=feed_dict,
+                fetch_list=fetch_targets)
 
-            calibrator.generate_sampling_program()
         test_info = []
         cnt = 0
         for batch_id, data in enumerate(val_reader()):
@@ -192,13 +190,7 @@ class TestCalibration(unittest.TestCase):
                       feed_dict[1]: label},
                 fetch_list=fetch_targets)
             if generate_int8:
-                for i in calibrator.sampling_program.list_vars():
-                    if i.name in calibrator.sampling_vars:
-                        np_data = np.array(fluid.global_scope().find_var(i.name)
-                                           .get_tensor())
-                        if i.name not in sampling_data:
-                            sampling_data[i.name] = []
-                        sampling_data[i.name].append(np_data)
+                calibrator.sample_data()
 
             test_info.append(np.mean(acc1) * len(data))
             cnt += len(data)
@@ -209,9 +201,8 @@ class TestCalibration(unittest.TestCase):
             break
 
         if generate_int8:
-            calibrator.generate_quantized_data(sampling_data)
-            fluid.io.save_inference_model(int8_model, feed_dict, fetch_targets,
-                                          exe, calibrator.sampling_program)
+            calibrator.save_int8_model()
+
             print(
                 "Calibration is done and the corresponding files were generated at {}".
                 format(os.path.abspath("calibration_out")))