diff --git a/ate/__init__.py b/ate/__init__.py
index 19442947..7320e64e 100644
--- a/ate/__init__.py
+++ b/ate/__init__.py
@@ -1 +1 @@
-__version__ = '0.7.0'
\ No newline at end of file
+__version__ = '0.7.1'
\ No newline at end of file
diff --git a/ate/testcase.py b/ate/testcase.py
index 17337ff0..b8fbfccb 100644
--- a/ate/testcase.py
+++ b/ate/testcase.py
@@ -149,9 +149,72 @@ def update_test_info(test_dict, dir_path):
     api_call = test_dict["api"]
     function_meta = parse_function(api_call)
     func_name = function_meta["func_name"]
+    api_call_args = function_meta["args"]
     api_info = get_api_definition(func_name, dir_path)
+    api_def_args = api_info.get("function_meta").get("args", [])
+
+    if len(api_call_args) != len(api_def_args):
+        raise exception.ParamsError("api call args invalid!")
+
+    args_mapping = {}
+    for index, item in enumerate(api_def_args):
+        if api_call_args[index] == item:
+            continue
+
+        args_mapping[item] = api_call_args[index]
+
+    if args_mapping:
+        api_info = substitute_variables_with_mapping(api_info, args_mapping)
+
     test_dict.update(api_info)
 
+def substitute_variables_with_mapping(content, mapping):
+    """ substitute variables in content with mapping
+    e.g.
+    @params
+        content = {
+            'request': {
+                'url': '/api/users/$uid',
+                'headers': {'token': '$token'}
+            }
+        }
+        mapping = {"$uid": 1000}
+    @return
+        {
+            'request': {
+                'url': '/api/users/1000',
+                'headers': {'token': '$token'}
+            }
+        }
+    """
+    if isinstance(content, (list, tuple)):
+        return [
+            substitute_variables_with_mapping(item, mapping)
+            for item in content
+        ]
+
+    if isinstance(content, dict):
+        substituted_data = {}
+        for key, value in content.items():
+            eval_key = substitute_variables_with_mapping(key, mapping)
+            eval_value = substitute_variables_with_mapping(value, mapping)
+            substituted_data[eval_key] = eval_value
+
+        return substituted_data
+
+    if isinstance(content, (int, utils.long_type, float, complex)):
+        return content
+
+    # content is in string format here
+    for var, value in mapping.items():
+        if content == var:
+            # content is a variable
+            content = value
+        else:
+            content = content.replace(var, str(value))
+
+    return content
+
 def get_api_definition(name, dir_path):
     """ get expected api from dir_path upward recursively
     @param
diff --git a/tests/data/api.yml b/tests/data/api.yml
index 0143e550..1e641a54 100644
--- a/tests/data/api.yml
+++ b/tests/data/api.yml
@@ -1,5 +1,5 @@
 - api:
-    def: get_token($user_name, $device_sn, $os_platform, $app_version)
+    def: get_token($user_agent, $device_sn, $os_platform, $app_version)
     request:
         url: /api/get-token
         method: POST
diff --git a/tests/data/demo_testset_layer.yml b/tests/data/demo_testset_layer.yml
index 0ed32bc3..ed107f93 100644
--- a/tests/data/demo_testset_layer.yml
+++ b/tests/data/demo_testset_layer.yml
@@ -20,10 +20,9 @@
 - test:
     name: create user which does not exist
     variable_binds:
-        - uid: 1000
         - user_name: "user1"
         - user_password: "123456"
-    api: create_user($uid, $user_name, $user_password, $token)
+    api: create_user(1000, $user_name, $user_password, $token)
     validators:
         - {"check": "status_code", "comparator": "eq", "expected": 201}
         - {"check": "content.success", "comparator": "eq", "expected": true}
@@ -31,10 +30,9 @@
 - test:
     name: create user which does not exist
     variable_binds:
-        - uid: 1000
         - user_name: "user1"
         - user_password: "123456"
-    api: create_user($uid, $user_name, $user_password, $token)
+    api: create_user(1000, $user_name, $user_password, $token)
     validators:
         - {"check": "status_code", "comparator": "eq", "expected": 500}
         - {"check": "content.success", "comparator": "eq", "expected": false}
diff --git a/tests/test_testcase.py b/tests/test_testcase.py
index 674abed0..0a19345e 100644
--- a/tests/test_testcase.py
+++ b/tests/test_testcase.py
@@ -419,18 +419,34 @@ class TestcaseParserUnittest(unittest.TestCase):
         testsets_list = testcase.load_testcases_by_path(path)
         self.assertIn("variable_binds", testsets_list[0]["config"])
         self.assertIn("request", testsets_list[0]["config"])
-        print(testsets_list[0]["testcases"][0])
         self.assertIn("request", testsets_list[0]["testcases"][0])
         self.assertIn("url", testsets_list[0]["testcases"][0]["request"])
         self.assertIn("validators", testsets_list[0]["testcases"][0])
 
+    def test_substitute_variables_with_mapping(self):
+        content = {
+            'request': {
+                'url': '/api/users/$uid',
+                'method': "$method",
+                'headers': {'token': '$token'}
+            }
+        }
+        mapping = {
+            "$uid": 1000,
+            "$method": "POST"
+        }
+        result = testcase.substitute_variables_with_mapping(content, mapping)
+        self.assertEqual("/api/users/1000", result["request"]["url"])
+        self.assertEqual("$token", result["request"]["headers"]["token"])
+        self.assertEqual("POST", result["request"]["method"])
+
     def test_load_api_definition(self):
         path = os.path.join(
             os.getcwd(), 'tests/data')
         api_dir_dict = testcase.load_api_definition(path)
         self.assertIn("get_token", api_dir_dict)
         self.assertEqual("/api/get-token", api_dir_dict["get_token"]["request"]["url"])
-        self.assertIn("$user_name", api_dir_dict["get_token"]["function_meta"]["args"])
+        self.assertIn("$user_agent", api_dir_dict["get_token"]["function_meta"]["args"])
         self.assertIn("create_user", api_dir_dict)
 
     def test_get_api_definition(self):