Throughout the history of China's ancient literature, drama is an indispensable part, but the status of drama in ancient China is far less than that of poetry. The literati class, the main creators of literary works, generally regards poetry as orthodox, but thinks that drama can't be elegant, and regards the literati who write dramatic works as vulgar. Therefore, the peak of China's classical drama creation is much later than that of poetry, and the research on specialized drama theory closely related to the creation of drama works has not been fully carried out. Some are only the comments of a few words scattered in the drama works, and some are only the study of melody, but few people pay attention to the indispensable structure of the drama works. Until the Qing Dynasty, Li Yu devoted all his life, collected the achievements of his predecessors, set a precedent in history, and created Suiyuan, which broke this situation. It is the first complete and comprehensive monograph on drama theory in the history of China classical drama. Leisure is rich in content, including drama theory, health care and living room, among which drama theory represents the peak of China's classical drama theory. His drama theory has always been the focus of domestic scholars' research, and has made great achievements and exerted great influence. However, in sharp contrast to the research fever of Li Yu's drama theory in China, Li Yu and his drama theory are in a bleak situation in the western world: many western drama theorists have never mentioned Li Yu in related works, and there is still no full translation of Leisure. It can be seen that although Li Yu's drama theory has great value, it has not attracted the attention of the western world. Under the background of globalization, in order to promote world cultural exchanges and enhance China's cultural soft power, it is necessary to increase the foreign translation and dissemination of Casual Love and expand the world influence of Li Yu's drama theory. Based on the study of the text of Casual Love, this paper deeply analyzes the theoretical value of drama, and further discusses the translation value and promotion strategy of Casual Love. The first chapter mainly introduces the brief introduction of Li Yu's life and the writing background of Suiyuan. With the book "Follow the Fate" as the background, it shows that Li Yu's drama theory is developed and innovated on the basis of predecessors' theories. The second chapter mainly includes two parts. First of all, on the basis of analyzing the text of Casual Love, this paper discusses Li Yu's drama theory in detail. Secondly, Li Yu's drama theory not only has a very high position in the history of China's classical drama theory, but also has a very important influence in the history of world theory. At the same time, the translation and introduction of classic texts abroad is also the need of the times and countries. Therefore, it is imperative to translate and disseminate the book Casual Sentiment, which carries Li Yu's drama theory. The third chapter mainly discusses the current situation of the spread of the drama theory in Casual Love, and tries to translate the key words of Li Yu's drama theory, and discusses the problems that should be paid attention to in the translation process and some translation strategies. The fourth chapter mainly takes the translation and dissemination of Li Yu's drama theory in Casual Love as an example to discuss the translation and dissemination strategies of China's classical literary texts. This paper mainly discusses translation strategies, government support and media. The government's support provided the material basis and guarantee for the foreign translation of China's classical literature texts, and adopted appropriate methods.