Self-protection is a poem about an abandoned wife. Described the process of abandoned wife and ungrateful man from engagement to being abused and abandoned. It expresses the pain and sadness that the abandoned wife was abandoned because of abuse, and also expresses her anger at the "two-thirds" (half-hearted) man. Although she is also very helpless about the past, her loyalty to love and marriage shows a firm protest. The narrative of the poem seems to be arranged along the development of things, but it is written with ups and downs. There is the expectation of first love, the joy of getting married, the pain of being abused, the sadness of being abandoned and the unbearable sigh. Among them, contrast, changes before and after, and personality of men and women are implicitly used. This change in state of affairs and feelings is even manifested in the language of poetry. When A Qing and his men explained the Biography of Shi Mao, they wrote: "Self-protection is called ignorance. In Meng, when you don't know a man, you are called Meng. Covenant and marriage are called sons, sons are called men, marriages are called scholars and scholars are called husbands. " And what to choose as an image is not only an apt and vivid metaphor, but also implies the context of emotional events. At the time of first marriage, mulberry was "its leaves can be fat", and it was "its yellow and falling" when it was abandoned. Wonderful twists and turns, feelings are winding, and reading is full of charm.