“其”是高中文言文中最常见的虚词之一,它属于多义虚词,使用频率高,用法极其灵活。采用穷尽式的调查方法将其用法主要归类为代词和副词。将代词分为人称代词、指示代词和复指代词。副词主要分为:表委婉的推测语气副词,表反问的疑问语气副词,表希望、祈使、命令的语气副词和表假设的语气副词。与此同时,还对“其”的用法和词组进行了归纳总结,对虚词“其”的简析,对高中文言文的阅读和理解有重要的意义。 “Its ” is one of the most common function words in high school Chinese. It belongs to polysemy, which is used frequently and the usage is extremely flexible. Using exhaustive methods of investigation, their usage is mainly classified as pronouns and adverbs. Pronouns are divided into personal pronouns, demonstrative pronoun and compound pronoun. The adverbs are mainly divided into: euphemism’s speculative modal adverbs, interrogative rhetorical adverbs, hope on the table, prayers, ordered modal adverbs and adverbs of the assumed hypotheses. At the same time, it also summarizes the usage and phrases of “its ”. The analysis of function words “its ” is of great significance to the reading and understanding of high school Chinese.