diff --git a/mmdet/api/__init__.py b/mmdet/apis/__init__.py
similarity index 100%
rename from mmdet/api/__init__.py
rename to mmdet/apis/__init__.py
diff --git a/mmdet/api/env.py b/mmdet/apis/env.py
similarity index 100%
rename from mmdet/api/env.py
rename to mmdet/apis/env.py
diff --git a/mmdet/api/inference.py b/mmdet/apis/inference.py
similarity index 100%
rename from mmdet/api/inference.py
rename to mmdet/apis/inference.py
diff --git a/mmdet/api/train.py b/mmdet/apis/train.py
similarity index 100%
rename from mmdet/api/train.py
rename to mmdet/apis/train.py
diff --git a/tools/train.py b/tools/train.py
index 52f302c3f0ecec1a3b9629a36351ea5a73cccb0e..8e03628db5ea28d027ccdc3939c72bace482be93 100644
--- a/tools/train.py
+++ b/tools/train.py
@@ -5,8 +5,8 @@ from mmcv import Config
 from mmcv.runner import obj_from_dict
 
 from mmdet import datasets, __version__
-from mmdet.api import (train_detector, init_dist, get_root_logger,
-                       set_random_seed)
+from mmdet.apis import (train_detector, init_dist, get_root_logger,
+                        set_random_seed)
 from mmdet.models import build_detector