Qian Zhongshu's academic existence is divided into three development stages.The first stage is the academic initiation period when he was very talented and his academic career began;The second is the academic development period when he devoted himself to comparative literature;The third is the academic maturity period when he achieved mastery through a comprehensive academic research. His academic evolution course has highly conformed to the modern western academic development situation and corresponds to the Chinese modern academic transformation process, forming an indiapensible part of it.