“Dui” is a frequently used preposition in modern Chinese. Its meaning and usage is very rich which can mean “towards, to”, and can mean “treatment”, and can also constitute phrases like “dui...lai shuo”. On the basis of previous studies, this paper analyzes some of the syntactic and semantic problems in the Chinese “dui” sentence from the perspectives of diachronic and synchronic methods, and uses the method of categorization to summarize the predicate form in the “dui” sentences. In this paper, we will use the comparative analysis method to compare the “dui” sentence and the corresponding general predicate sentence in order to better understand and analyze the syntactic and semantic form of the word “dui”.