diff --git a/httprunner/loader.py b/httprunner/loader.py
index d86cb07b..55857907 100644
--- a/httprunner/loader.py
+++ b/httprunner/loader.py
@@ -6,10 +6,9 @@ import json
 import os
 
 import yaml
-from httprunner import exceptions, logger, parser, validator
+from httprunner import built_in, exceptions, logger, parser, validator
 from httprunner.compat import OrderedDict
 
-
 project_mapping = {
     "debugtalk": {},
     "env": {},
@@ -297,7 +296,7 @@ def load_python_module(module):
 
 
 def load_debugtalk_module(start_path=None):
-    """ load debugtalk.py module.
+    """ load built_in module and project debugtalk.py module.
 
     Args:
         start_path (str, optional): start locating path, maybe file path or directory path.
@@ -312,22 +311,27 @@ def load_debugtalk_module(start_path=None):
             }
 
     """
+    # load built_in module
+    built_in_module = load_python_module(built_in)
+
     start_path = start_path or os.getcwd()
 
     try:
         module_path = locate_file(start_path, "debugtalk.py")
         module_name = convert_module_name(module_path)
     except exceptions.FileNotFound:
-        return {
-            "variables": {},
-            "functions": {}
-        }
+        return built_in_module
 
+    # load debugtalk.py module
     imported_module = importlib.import_module(module_name)
-    loaded_module = load_python_module(imported_module)
+    debugtalk_module = load_python_module(imported_module)
 
-    project_mapping["debugtalk"] = loaded_module
-    return loaded_module
+    # override built_in module with debugtalk.py module
+    debugtalk_module["variables"].update(built_in_module["variables"])
+    debugtalk_module["functions"].update(built_in_module["functions"])
+
+    project_mapping["debugtalk"] = debugtalk_module
+    return debugtalk_module
 
 
 def get_module_item(module_mapping, item_type, item_name):
diff --git a/tests/test_loader.py b/tests/test_loader.py
index 382f34b5..339b718b 100644
--- a/tests/test_loader.py
+++ b/tests/test_loader.py
@@ -170,6 +170,7 @@ class TestFileLoader(unittest.TestCase):
             "tests/debugtalk.py"
         )
 
+
 class TestModuleLoader(unittest.TestCase):
 
     def test_filter_module_functions(self):
@@ -180,8 +181,10 @@ class TestModuleLoader(unittest.TestCase):
 
     def test_load_debugtalk_module(self):
         imported_module_items = loader.load_debugtalk_module()
-        self.assertEqual(imported_module_items["functions"], {})
-        self.assertEqual(imported_module_items["variables"], {})
+        self.assertIn("basestring", imported_module_items["variables"])
+        self.assertIn("equals", imported_module_items["functions"])
+        self.assertNotIn("SECRET_KEY", imported_module_items["variables"])
+        self.assertNotIn("alter_response", imported_module_items["functions"])
 
         imported_module_items = loader.load_debugtalk_module("tests")
         self.assertEqual(