diff --git a/pydu/request.py b/pydu/request.py
index a7c8e18..a04e499 100644
--- a/pydu/request.py
+++ b/pydu/request.py
@@ -139,21 +139,18 @@ def update_query_params(url, params):
     return new_url
 
 
-def cookies_string_to_dict(cookies_string):
+def cookies_str_to_dict(cookies):
     """
-    Transform cookies which is type of string  to the type of dict
+    Convert cookies from str to dict.
     """
-    if not cookies_string or cookies_string == '':
-        raise ValueError("Invalid blank param of cookies_string !")
-    if not isinstance(cookies_string, str):
-        raise TypeError("Invalid type of cookies_string !")
-    cookies_dict = {}
-    for single_mapping_item in cookies_string.split(";"):
-        single_mapping_item = single_mapping_item.strip().replace("\t", "").replace("\n", "")
-        if '=' not in single_mapping_item:
+    if not isinstance(cookies, str):
+        raise TypeError('Invalid type of cookies_string !')
+
+    cookies_obj = {}
+    for item in cookies.split(';'):
+        item = item.strip().replace('\t', '').replace('\n', '')
+        if '=' not in item:
             continue
-        kv_list = single_mapping_item.split('=')
-        if len(kv_list) == 0:
-            continue
-        cookies_dict[kv_list[0]] = kv_list[1]
-    return cookies_dict
\ No newline at end of file
+        key, value = item.split('=', 1)
+        cookies_obj[key] = value
+    return cookies_obj
diff --git a/stubs/pydu/request.pyi b/stubs/pydu/request.pyi
index 94bd354..ab153b8 100644
--- a/stubs/pydu/request.pyi
+++ b/stubs/pydu/request.pyi
@@ -12,4 +12,4 @@ class FileName(object):
 def download(url: str, dst: str=None) -> str: ...
 def check_connect(ip: str, port: int, retry: int=1, timout: float=0.5) -> Optional[str]: ...
 def update_query_params(url: str, params: dict) -> str: ...
-def cookies_string_to_dict(cookies_string: str) -> dict: ...
+def cookies_str_to_dict(cookies: str) -> dict: ...
diff --git a/tests/test_request.py b/tests/test_request.py
index 56a0dce..1877d56 100644
--- a/tests/test_request.py
+++ b/tests/test_request.py
@@ -2,7 +2,7 @@ import socket
 from .testing import mockserver
 import pydu.request
 from pydu.network import get_free_port
-from pydu.request import FileName, check_connect, update_query_params, cookies_string_to_dict
+from pydu.request import FileName, check_connect, update_query_params, cookies_str_to_dict
 
 
 def test_filename_from_url():
@@ -62,10 +62,9 @@ def test_update_query_params():
            (base + '?foo=2&bar=3', base + '?bar=3&foo=2')
 
 
-def test_cookies_string_to_dict():
-    cookies_string = """
-    _ga=GA1.2.129780172.1530933530; _gid=GA1.2.1377057427.1530933530; ajs_anonymous_id=%228c887ac4-df75-4251-bd83-453dffab984f%22;
-    """
-    cookies_dict = cookies_string_to_dict(cookies_string=cookies_string)
-    assert cookies_dict is not None
-    assert isinstance(cookies_dict, dict)
+def test_cookies_str_to_dict():
+    cookies = cookies_str_to_dict('a=a;  \tb=b;\nc=c;d;e=')
+    assert cookies['a'] == 'a'
+    assert cookies['b'] == 'b'
+    assert cookies['c'] == 'c'
+    assert cookies['e'] == ''