diff --git a/ppsci/arch/gan.py b/ppsci/arch/gan.py
index 3daf311e6..9a3f4a8ad 100644
--- a/ppsci/arch/gan.py
+++ b/ppsci/arch/gan.py
@@ -182,6 +182,14 @@ class Generator(base.Arch):
         >>> use_bns_tuple = ((True, True, True), ) * 3 + ((False, False, False), )
         >>> acts_tuple = (("relu", None, None), ) * 4
         >>> model = ppsci.arch.Generator(("in",), ("out",), in_channel, out_channels_tuple, kernel_sizes_tuple, strides_tuple, use_bns_tuple, acts_tuple)
+        >>> batch_size = 4
+        >>> height = 64
+        >>> width = 64
+        >>> input_data = paddle.randn([batch_size, in_channel, height, width])
+        >>> input_dict = {'in': input_data}
+        >>> output_data = model(input_dict)
+        >>> print(output_data['out'].shape)
+        [4, 1, 64, 64]
     """
 
     def __init__(