《左傳微》係評點《左傳》之作，成書於科舉即將見廢的環境下，作者吳闓生(1877-1949)，兼有中西學術背景，且《左傳微》正式發行是在新文化運動反對傳統學術之際，因之本文欲探究的是，在如此變動的時局下，《左傳微》對《左傳》的闡解是否有殊別於傳統處？其評點在《左傳》學流變史上的意義為何？吳闓生於《左傳微•例言》明言「此編專以發明《左氏》微言為主。」為了讓經典所存之「恆常至道」不被誤解，故於大義之外，對深曲委婉方式表達的微言，更仔細爬梳。綜觀吳闓生於《左傳微》所提出的微言眇意，實仍以尊王、黜霸、攘夷等大義為主軸，從而檢視人物的道德甚至心機。《左傳微》研尋的義理，有涵融三傳之處；也不排斥偶以西方學術論《左傳》微言；對封建尊尊精神，也重新辨析，力圖與「以德禮率下，不飾偽也」的精神會通；而這樣的作法的確很能展現經典面對新時代的新精神。吳闓生在細密點評之中，關注的仍是經義，此正其尊經作法。尤其在經典邊緣化的風氣底下，《左傳微》明揭以經讀之，已是充分體認而力圖振作的宣示。而混論三傳或引子論傳，以及展現傳統尊尊思維的是非精神，皆以經典的包容性展現其時代精神。而所謂微言眇旨的發掘，除了充分展現語言的曲折美學之外，其實亦顯示經學解說的多樣化，凡此，皆其未許經典向黃昏之苦心也。

Zhuo-Chuan-Wei is one of ping-dien critics of Zhuo-Chuan. It was written in the era that imperial examination was terminating, and the sanctity of Confucian classics was losing, also this book was published after New Culture Movement when scholars had classical educations but began to lead a revolt against Confucian culture. They were eager to create a new Chinese culture based on global and western standards. In this situation, the interpretations or critics of Zhuo-Chuan in Zhuo-Chuan-Wei must be different form the other interpretations or critics. Therefore, this essay focuses on the spirit of the times which was showed on Zhuo-Chuan-Wei. Some of the interpretations about Zhuo-Chuan in Zhuo-Chuan-Wei are a blend of Three Commentaries on The Spring and Autumn Annals. Sometimes it cited western ideas to explain terse but highly significant statements in Zhuo-Chuan.; The author, Wu-Kai-Shen, made efforts in converting class notion in feudal society to courtesy. All of these interpretations showed Wu-Kai-Shen devoted himself to keep the classics from fading away. The main ping-dien critics in Zhuo-Chuan-Wei are the interpretations on 'veiled/subtle words with great moral purports'. Wu-Kai-Shen insisted the values of classics saved in these great moral purports are eternal, this was what Wu-Kai-Shen had done obviously to maintain the Sanctity of Zhuo-Chuan.