diff --git a/common/global_call.py b/common/global_call.py
index 4289d94cc75802fa0ee6fd3ac081dbd481c4f59a..d538b466b4be1bcb075e78e95aebefada687a74c 100644
--- a/common/global_call.py
+++ b/common/global_call.py
@@ -39,6 +39,23 @@ class GlobalCall:
         else:
             return False, default
 
+    @staticmethod
+    def get_str(k , default ):
+        cfg = Config.get_json_dict()
+        arr = k.strip().split('.')
+
+        while 1 < len(arr):
+            if arr[0] not in cfg:
+                return default
+
+            cfg = cfg[arr[0]]
+            arr.remove(arr[0])
+
+        if arr[0] in cfg:
+            return str(cfg[arr[0]])
+        else:
+            return default
+
     @staticmethod
     def get_json_value(k , default, cfg = Config.get_json_dict()):
         '''