Wellek's literary theory mainly introduced literary studies in the following ways: 1. The division of literary history: Wellek divided literary history into traditional literature, modern literature and post-modern literature, and put forward the corresponding literary characteristics and development trends. 2. Analysis and evaluation of literary works: Wellek advocated in-depth analysis and evaluation of literary works, including the thoughts, emotions, artistic techniques and other aspects of the works, and put forward the corresponding literary views and theories. 3. Exploration of literary phenomena: Wellek paid close attention to literary phenomena such as literary revolution, realism, post-realism, etc. He explored the reasons and characteristics behind these phenomena and put forward corresponding theoretical explanations. 4. The relationship between literature and society: Wellek believed that literature and society had a close relationship. Literature often reflected the social situation and people's lives at that time. Therefore, the study of literature also needed to consider the social and cultural background. 5. Methods of literary research: Wellek introduced a variety of literary research methods, such as literature research, positive research, cultural research, etc. These methods can help researchers understand literary works and literary phenomena and reveal the nature behind them.