diff --git a/pydu/file.py b/pydu/file.py
index d169d97..699537d 100644
--- a/pydu/file.py
+++ b/pydu/file.py
@@ -5,12 +5,12 @@ import shutil
 
 # todo tests and docs
 def makedirs(path, mode=0o755, ignore_errors=False, exist_ok=True):
+    if exist_ok and os.path.exists(path):
+        return
     try:
         os.makedirs(path, mode)
     except Exception:
         if not ignore_errors:
-            if not exist_ok:
-                raise OSError('{} is exist'.format(path))
             raise OSError('Create dir: {} error.')
 
 
diff --git a/tests/test_file.py b/tests/test_file.py
index 3f33417..a4260a7 100644
--- a/tests/test_file.py
+++ b/tests/test_file.py
@@ -4,16 +4,19 @@ import pytest
 
 
 class Testmakedirs():
-    def test_makedirs(self,tmpdir):
+    def test_makedirs(self, tmpdir):
         path = str(tmpdir.join('test'))
         makedirs(path)
         assert os.path.exists(path)
 
-    def test_makedirs_with_exists_path(self,tmpdir):
+    def test_makedirs_with_exists_path(self, tmpdir):
         path = str(tmpdir.join('test'))
         makedirs(path)
-        with pytest.raises(Exception) as e_info:
-            makedirs(path, exist_ok=True)
+
+        makedirs(path, exist_ok=True)
+
+        with pytest.raises(Exception):
+            makedirs(path, exist_ok=False)
 
     def test_makedirs_with_ignore_error(self, tmpdir):
         path = str(tmpdir.join('test'))
@@ -23,8 +26,8 @@ class Testmakedirs():
     def test_makedirs_without_ignore_error(self, tmpdir):
         path = str(tmpdir.join('test'))
         makedirs(path)
-        with pytest.raises(Exception) as e_info:
-            makedirs(path, ignore_errors=False)
+        with pytest.raises(Exception):
+            makedirs(path, ignore_errors=False, exist_ok=False)
 
     def test_makedirs_with_mutl_dirs(self, tmpdir):
         path = str(tmpdir.join('test/test'))