Poetry mainly uses contrast and contrast in art, for example, in couplets, the poet uses "tiger swimming for the night" to set off the typical environment on the way to escape; At the same time, the poet also announced the news with the chicken whistle in the court, which set off Ma Guiyi's "Tiger Brigade Spending the Night" and put the joys and sorrows of the past, the different situations and moods of the past security and danger. Another example is the contrast between "six armies stationed in Malaysia together" and "laughing and kissing cows on Tanabata" in the Necklace, which is rich in meaning and intriguing. Xuanzong and Yang Guifei exchanged vows on Tanabata that year; To "be husband and wife forever", I only laugh at the cowherd and weaver girl once a year. Now that the Sixth Army has not sent her, Yang Guifei has finally been "given death", and Xuanzong's hypocritical and selfish mental outlook has also been exposed. Another example is the tail connection, which also contains strong contrast. On the one hand, Tang Xuanzong failed to keep his beloved concubine, on the other hand, as an ordinary people, the Lujia family was able to keep his wife Mochow. Why is the emperor inferior to ordinary people? Persistent thinking.