Cao Yu is the most outstanding pioneer in the history of modern drama in China and the founder of China's drama. He laid the foundation for the development of China's drama from introduction to maturity. Modern drama, as a transplanted art variety, started not too late in new literature. With the active efforts of four founders, Hu Shi, Tian Han, Hong Shen and Ou Yangyuqian, it has been promoting the development of drama. The development of modern drama has never been highly recognized, and it has never really felt the real charm of drama. With the appearance of Cao, Thunderstorm and Sunrise, the readers and audiences in China were truly shocked and fascinated by the drama, while the modern drama in China really matured, strictly speaking, after the advent of Cao Yu's plays. These two works established Cao's position in the history of literature. Cao Yu's drama creation has formed its own unique style from the aspects of artistic structure, characters and language forms, which shows the value of China's modern drama. Is the most China, but also the least China, he knows the expression method of China's traditional drama, and he shows the typical traditional China plot in China, which is the most China. Because he knows that drama is a kind of foreign drama, he has his own characteristics to understand, pay attention to language, and use dialogue between characters to express the plot, which is the least China. Cao was the first person to introduce China's plays into China's plays in theory and practice. Give full play to the power of tragedy, and achieve China's plays in both stage and theory. His appearance is the peak, and his existence exists for drama. Structurally, life is full of drama and conflict, and he is good at using accidents and coincidences to construct fierce dramatic conflicts. In accident, he hinted at necessity, and in coincidence, he tried to grasp fate and its uncertainty.