Self-protection has two meanings: one is Chinese words, which are often pronounced as méng and máng； in ancient times; In modern times; The second is the title of The Book of Songs Feng Wei, which describes a woman's process from love, marriage, abuse to abandonment. Her sad feelings and firm attitude profoundly reflected the oppression and harm of the unequal marriage system between men and women in society at that time. Although it is a narrative poem, it has a strong emotional color.