diff --git a/doc/getstarted/concepts/src/infer.py b/doc/getstarted/concepts/src/infer.py
index 780d831da834e046786efc112f2642004e32f86f..4cc58dfee0bd6dade0340b4fd0ee1adb49ffebf6 100644
--- a/doc/getstarted/concepts/src/infer.py
+++ b/doc/getstarted/concepts/src/infer.py
@@ -6,9 +6,13 @@ x = paddle.layer.data(name='x', type=paddle.data_type.dense_vector(2))
 y_predict = paddle.layer.fc(input=x, size=1, act=paddle.activation.Linear())
 
 # loading the model which generated by training
-with open('hello_params_pass_90.tar', 'r') as f:
+with open('params_pass_90.tar', 'r') as f:
     parameters = paddle.parameters.Parameters.from_tar(f)
 
-i = [[[1, 2]]]
-
+# Input multiple sets of data，Output the infer result in a array.
+i = [[[1, 2]], [[3, 4]], [[5, 6]]]
 print paddle.infer(output_layer=y_predict, parameters=parameters, input=i)
+# Will print:
+# [[ -3.24491572]
+#  [ -6.94668722]
+#  [-10.64845848]]