Four rhymes: Han Fu, Tang Poetry, Song Poetry and Yuan Qu. Among them, Yuanqu is also called sandwich. Yuanqu is a popular literary form in the Yuan Dynasty, including zaju and Sanqu, sometimes referring to zaju. Zaju is a performance form characterized by funny in Song Dynasty. The Yuan Dynasty developed into a form of China traditional opera, with 60% discount for each book and a wedge at the beginning or between folds. Each fold is composed of Bai Bin and Beiqu Suite with the same tone and rhyme. Such as Guan Hanqing's Dou Eyuan. Popular in Dadu (now Beijing) area. There are also dramas in Ming and Qing dynasties, but there is no limit to 60% discount per book. Sanqu is a popular music form in Yuan, Ming and Qing Dynasties, and it has no object. The content is mainly lyrical, including poems and essays.