Why write a poem of twelve chrysanthemums? In the thirty-seventh chapter of A Dream of Red Mansions, Heng Wuyuan raised a topic of night chrysanthemums. Xiangyun read it once and said with a smile, "Ten is not enough. If you add up to twelve books, that's all, just like other people's picture books. " In ancient China, a brochure of calligraphy and painting required twelve pages to form a painting. Twelve is a number representing a complete unit, which also means perfection. There are 12 zodiac signs in our country, which can cover everyone. In A Dream of Red Mansions, Cao Xueqin has a special liking for the number "twelve". A Dream of Red Mansions, also known as Twelve Women in Jinling, shows the fate of the boudoir represented by Twelve Women in Jinling.