“吃”字被动句是汉语被动句的演变历程中极具特点和研究性的代表。本文从“吃”字被动句的起源、语法虚化过程、句式特点等方面对这一句式进行系统性考察。绪论“吃”字被动句是指主语是受事,由被动关系介词“吃”介引出施事,或者直接将“吃”置于动词前表示被动的句子。对于“吃”字被动句的研究已有不少,以江蓝生《被动关系词“吃”字的来源 “Eat ” Passive sentence is a very characteristic and research representative in the evolution of Chinese passive sentences. This article systematically inspects this sentence form from the origin of “passive” sentence, the process of grammaticalization and the features of sentence pattern. Introduction “eat ” passive sentence is the subject is the subject, by the passive relational preposition “eating ” mediated introduction, or directly “eat ” before the verb to express the passive sentence. There have been many researches on the passive sentence of “eating”, and the source of the word “passive relationship”