diff --git a/paddle/scripts/run_python_tests.sh b/paddle/scripts/run_python_tests.sh
index 05c187522cabc5d9b7688f2a1999c25672e4c550..02d2cdb977473c1032b06ffca59544b3ba98d1fa 100755
--- a/paddle/scripts/run_python_tests.sh
+++ b/paddle/scripts/run_python_tests.sh
@@ -29,7 +29,7 @@ if [ $USE_VIRTUALENV_FOR_TEST -ne 0 ]; then
 fi
 
 export PYTHONPATH=$SCRIPTPATH/../../python/
-$PYTHON -m pip install $SCRIPTPATH/../dist/*.whl requests matplotlib ipython==5.3
+$PYTHON -m pip install $SCRIPTPATH/../dist/*.whl requests matplotlib opencv-python ipython==5.3
 
 for fn in "$@"
 do
diff --git a/python/paddle/v2/image.py b/python/paddle/v2/image.py
index 20dcc96782c77847abf3dcffa342dd264fc50970..ca75efd90dd2ea7ad3b711a5fa53f3593c3f0738 100644
--- a/python/paddle/v2/image.py
+++ b/python/paddle/v2/image.py
@@ -45,8 +45,13 @@ def load_image(file, is_color=True):
                      return a color image. Otherwise, it will
                      load and return a gray image.
     """
-    flag = cv2.CV_LOAD_IMAGE_COLOR if is_color else \
-           cv2.CV_LOAD_IMAGE_GRAYSCALE
+    # cv2.IMAGE_COLOR for OpenCV3
+    # cv2.CV_LOAD_IMAGE_COLOR for older OpenCV Version
+    # cv2.IMAGE_GRAYSCALE for OpenCV3
+    # cv2.CV_LOAD_IMAGE_GRAYSCALE for older OpenCV Version
+    # Here, use constant 1 and 0
+    # 1: COLOR, 0: GRAYSCALE
+    flag = 1 if is_color else 0
     im = cv2.imread(file, flag)
     return im
 
@@ -178,6 +183,11 @@ def simple_transform(im, resize_size, crop_size, is_train, is_color=True):
     Simply data argumentation for traing. These operations includes
     resizing, croping and flipping.
 
+    Example usage:
+    
+    .. code-block:: python
+        im = simple_transform(im, 256, 224, True)
+
     :param im: The input image with HWC layout.
     :type im: ndarray
     :param resize_size: The shorter edge length of the resized image.
@@ -209,6 +219,11 @@ def load_and_transform(filename,
     data argumentation. Please refer the `simple_transform` interface
     for the transform operation.
 
+    Example usage:
+    
+    .. code-block:: python
+        im = load_and_transform('cat.jpg', 256, 224, True)
+
     :param filename: The file name of input image.
     :type filename: string
     :param resize_size: The shorter edge length of the resized image.
diff --git a/python/paddle/v2/tests/CMakeLists.txt b/python/paddle/v2/tests/CMakeLists.txt
index 0b8c78b465c13dd58856308c7c09f172e035f884..eb02e53706b4834eb9dc75d0e3a809772b124725 100644
--- a/python/paddle/v2/tests/CMakeLists.txt
+++ b/python/paddle/v2/tests/CMakeLists.txt
@@ -1,2 +1,2 @@
 add_python_test(test_v2_api test_data_feeder.py test_parameters.py
-test_layer.py test_rnn_layer.py test_topology.py test_image)
+test_layer.py test_rnn_layer.py test_topology.py test_image.py)
diff --git a/python/paddle/v2/tests/test_image.py b/python/paddle/v2/tests/test_image.py
index 5aa612f91d344b8b29566b81ea07e77ba0e4c599..b2d773510de28ca2614e95b465c73b82aa7b0463 100644
--- a/python/paddle/v2/tests/test_image.py
+++ b/python/paddle/v2/tests/test_image.py
@@ -26,7 +26,7 @@ class Image(unittest.TestCase):
         self.assertEqual(3, im.shape[2])
 
         # flip
-        im = left_right_flip(im)
+        im = image.left_right_flip(im)
         im2 = np.flip(im, 1)
         self.assertEqual(im.all(), im2.all())