diff --git a/ate/utils.py b/ate/utils.py
index 32ea1166..4127dbaf 100644
--- a/ate/utils.py
+++ b/ate/utils.py
@@ -7,7 +7,7 @@ import re
 import string
 
 import yaml
-from ate.exception import ParamsError
+from ate import exception
 
 try:
     string_type = basestring
@@ -47,7 +47,7 @@ def load_testcases(testcase_file_path):
         return load_yaml_file(testcase_file_path)
     else:
         # '' or other suffix
-        raise ParamsError("Bad testcase file name!")
+        return []
 
 def load_foler_files(folder_path):
     """ load folder path, return all files in list format.
@@ -96,10 +96,7 @@ def load_testcases_by_path(path):
             "config": {},
             "testcases": []
         }
-        try:
-            testcases_list = load_testcases(path)
-        except ParamsError:
-            return []
+        testcases_list = load_testcases(path)
 
         for item in testcases_list:
             for key in item:
@@ -143,7 +140,7 @@ def query_json(json_content, query, delimiter='.'):
                 key = int(key)
             json_content = json_content[key]
     except (KeyError, ValueError, IndexError):
-        raise ParamsError("invalid query string in extract_binds!")
+        raise exception.ParseResponseError("failed to query json when extracting response!")
 
     return json_content
 
@@ -191,7 +188,7 @@ def match_expected(value, expected, comparator="eq"):
         elif comparator in ["startswith"]:
             assert str(value).startswith(str(expected))
         else:
-            raise ParamsError("comparator not supported!")
+            raise exception.ParamsError("comparator not supported!")
 
         return True
     except AssertionError:
diff --git a/tests/test_response.py b/tests/test_response.py
index ee1e97e3..439f8420 100644
--- a/tests/test_response.py
+++ b/tests/test_response.py
@@ -116,7 +116,7 @@ class TestResponse(ApiServerUnittest):
         ]
         resp_obj = response.ResponseObject(resp)
 
-        with self.assertRaises(exception.ParamsError):
+        with self.assertRaises(exception.ParseResponseError):
             resp_obj.extract_response(extract_binds_list)
 
         extract_binds_list = [
@@ -124,7 +124,7 @@ class TestResponse(ApiServerUnittest):
         ]
         resp_obj = response.ResponseObject(resp)
 
-        with self.assertRaises(exception.ParamsError):
+        with self.assertRaises(exception.ParseResponseError):
             resp_obj.extract_response(extract_binds_list)
 
     def test_extract_response_json_string(self):
diff --git a/tests/test_utils.py b/tests/test_utils.py
index c918a667..863db016 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -7,8 +7,7 @@ class TestUtils(ApiServerUnittest):
 
     def test_load_testcases_bad_filepath(self):
         testcase_file_path = os.path.join(os.getcwd(), 'tests/data/demo')
-        with self.assertRaises(exception.ParamsError):
-            utils.load_testcases(testcase_file_path)
+        self.assertEqual(utils.load_testcases(testcase_file_path), [])
 
     def test_load_json_testcases(self):
         testcase_file_path = os.path.join(
@@ -132,11 +131,11 @@ class TestUtils(ApiServerUnittest):
         self.assertEqual(result, 3)
 
         query = "ids.str_key"
-        with self.assertRaises(exception.ParamsError):
+        with self.assertRaises(exception.ParseResponseError):
             utils.query_json(json_content, query)
 
         query = "ids.5"
-        with self.assertRaises(exception.ParamsError):
+        with self.assertRaises(exception.ParseResponseError):
             utils.query_json(json_content, query)
 
         query = "person.age"
@@ -144,7 +143,7 @@ class TestUtils(ApiServerUnittest):
         self.assertEqual(result, 29)
 
         query = "person.not_exist_key"
-        with self.assertRaises(exception.ParamsError):
+        with self.assertRaises(exception.ParseResponseError):
             utils.query_json(json_content, query)
 
         query = "person.cities.0"