介词“于”在上古汉语中有许多语法功能,而在现有的研究中,迄今仍未有效地对它的语法功能做出一个统一解释。近十多年,认知语言学的茁壮发展为汉语研究提供了新的视野和方法,在这个背景下,本文尝试在认知语法的理论框架内对“于”的介词意义和语法功能进行分析,以期从一个理论高度给这个语素进行统一解释,进而为解决汉语语法史中的一些难题提出初步的建议。 The preposition “Yu ” has many grammatical functions in Middle Ages, and in the existing research, it has not yet effectively provided a unified explanation of its grammatical functions. In the recent ten years, the robust development of cognitive linguistics has provided a new perspective and method for Chinese studies. Against this background, this paper attempts to study the meaning and grammatical functions of “” in the theoretical framework of cognitive grammar It analyzes the morpheme from a theoretical perspective and makes a preliminary suggestion to solve some difficult problems in the history of Chinese grammar.