On comparability-an important theoretical issue of comparative literature comparability is an important theoretical issue related to whether comparative literature can be established as a discipline and whether comparative research can be carried out effectively. The actual kinship, value and intersection between literary phenomena are the objective basis of comparability. In the study of Chinese and western comparative literature, in order to grasp comparability, we must do a good job in three aspects: discovery, investigation and selection. In today's comparative literature research, the characteristics of Russian and Soviet comparative literature and art should be paid enough attention. His thoughts on historical typology, regularity of literary influence, overall literary construction and interdisciplinary research all have unique perspectives and viewpoints different from those of western comparative literature, which have great enlightenment and influence on the discipline construction of comparative literature in China. Looking at the deep meaning of "medicine" from the perspective of comparative literature: Lu Xun's "Medicine" has a distinct imprint of western literature from the aspects of material selection, conception, characters, theme and artistic style, which shows Lu Xun's deep attachment to western literature. Lu Xun's sense of urgency and historical mission rooted in the depths of his soul made him consciously take awakening the people and rejuvenating the country as his fundamental mission. And his social ideal and tenacious personality made him cry and fight unswervingly; At the same time, his tragic psychology and unique aesthetics naturally reveal a desolate artistic style, which not only draws lessons from Andreev, but also recreates himself. Two Great Renaissance —— Italian Renaissance and China Literature during the May 4th Movement. In the comparative study of Chinese and foreign modern literature, people seldom pay attention to the influence of Italian literature on China literature. This paper aims to investigate the influence of May 4th literature on Italian Renaissance culture and literature from two aspects: literary consciousness and human discovery, so as to compare and discuss the value of May 4th new literature as "Renaissance" in China. From the perspective of comparative literature between China and Japan, this paper compares, analyzes and demonstrates the similarities and differences between Tao and Lin Daiyu, two tragic female images in China and Japan, from three aspects: sentimental and stubborn personality characteristics, emotional characteristics of singleness and jealousy exclusiveness, unequal love relationship and the nature of tragic fate, analyzes the psychological characteristics and unequal love relationship of women in ancient society, and reveals the essential reasons of their tragic fate. Mysterious beauty in troubled times "Mystery", an aesthetic thought, originated in China, which is one of China's poetry creation thoughts, and was introduced to Japan through Chinese translation of Buddhist scriptures, becoming the highest aesthetic ideal of Japanese chorus. This paper makes a parallel study of China's poems in Wei, Jin, Southern and Northern Dynasties and Japan's Middle Ages, which are separated by a whole thousand years, and explores the mysterious beauty that Chinese and Japanese poems are similar but different across time and space.