Abstract: The study on Beidao’s poetry creation after his immigration oversea shows that Beidao does not understand and even repels the present era. Meanwhile, he reflects on the background of the past age, which makes Beidao face more grief in nowadays. We can perceive today’s Beidao and previous Beidao, and the tension in his mind when he faces today’s Beijing and Beijing in the past. In fact, this demonstrates that he hovers between poetry creation and real background, poetry and reality, the reality in the poet’s imagination and the actual reality. The entanglement of life at present and in the past pushes Beidao to reflect on the past and the current. Hence, “changing the background” becomes the most important imagery in Beidao’s poetry creation oversea.