Thanks Hao Zheng ,but I want to do this:
Here is the tf.add_n  exmaple code
import tensorflow as tf;  
import numpy as np;  
input1 = tf.constant([1.0, 2.0, 3.0])  
input2 = tf.Variable(tf.random_uniform([3]))  
output = tf.add_n([input1, input2])  
init_op = tf.global_variables_initializer() 
with tf.Session() as sess:  
  sess.run(init_op)
  print(sess.run(input1))
  print(sess.run(input2))
  print(sess.run(output))


Output:
[1. 2. 3.]
[0.6231705  0.50447917 0.28593874]
[1.6231705 2.5044792 3.2859387]

But I want to do is like this , I could plus this two tensor!!