This paper introduces the definition, structure, music, role, creation and four masters of Yuan Zaju.

The Romance of the West Chamber is the masterpiece of Wang Shifu, a famous playwright in Yuan Dynasty, and it is also a beautiful and touching romance novel. As a script, it is called "Four Famous Dramas" together with Peony Pavilion, Palace of Eternal Life and Peach Blossom Fan, which embodies the highest achievement of China's ancient drama works. In Tang Dezong, Zhang Junrui, a gifted scholar in Luoyang, met Cui Yingying, the daughter of the late Prime Minister Cui Jue, at Pujiu Temple. They fell in love at first sight, and with the help of the maid matchmaker, they broke through the obstacles set by the old lady, the spokesperson of feudal ethics, experienced joys and sorrows, and finally got married. This story is vivid in content, tortuous in plot, touching, ups and downs, and it is immersive to read. This book is accompanied by exquisite comments, exquisite illustrations and ancient charm.

The synopsis of The West Chamber is as follows: Zhang Junrui, a scholar, went to Beijing to catch the exam, passed the Pujiu Temple in Hezhong House (now Yongji, Shanxi) and met Cui Yingying, a former Guo Xiang who lived in the temple. They fell in love at first sight, so they broke through the shackles of ethics, recited poems on a moonlit night, and played the piano to express their love. Unexpectedly, at this time, the thief surrounded the Pujiu Temple with Sun Feihu's troops, trying to rob Cui Yingying as the wife of the fortress. Mrs. Guo Xiang was forced to publicly promise that Yingying would marry anyone who could avoid thieves. Zhang Junrui turned to his good friend General Baima for help, and the besieged soldiers were released. However, after the incident was resolved, the lady broke her marriage and asked Cui and Zhang to call them brother and sister. Cui and Zhang fell into infinite pain again. Out of anger, Yingying's maid and matchmaker helped them deliver the letters. Cui and Zhang finally broke through all kinds of barriers and got married privately. In the face of the facts, Mrs. Guo Xiang was forced to allow marriage, but forced Zhang Junrui to enter Beijing for a trial marriage on the grounds that "three generations did not recruit white sons-in-law". Zhang Junrui lived up to expectations, won the first prize, returned home dressed in rags, and finally got married with Cui Yingying.