Cao Yu was a famous Chinese dramatist in the 20th century. His plays played an important role in the history of Chinese drama. Cao Yu's plays described the changes and contradictions in Chinese society from the 1920s to the 1940s with modern Chinese history as the background. His plays were unique in style, focusing on the complexity and contradiction of human nature. His works were full of deep thinking and reflection on social reality. Cao Yu's plays had a profound influence on the development of modern Chinese drama. His plays created a precedent for modern Chinese drama and laid the foundation for the development of Chinese drama. His plays were not only popular on the Chinese stage, but they also received a certain amount of recognition and praise internationally. In addition, Cao Yu's plays also deeply reflected the fighting spirit and national pride of the Chinese people. His plays portrayed the great achievements of the Chinese people through the arduous struggle and inspired the national pride and cohesion of the Chinese people. Cao Yu's plays had an important historical status and significance in the history of Chinese literature in the 20th century. His works not only promoted the development of modern Chinese drama, but also reflected the fighting spirit and national pride of the Chinese people.