本文探讨了先秦汉语主语省略的规律。研究表明，先秦汉语的主语大都是在词汇手段的辅助下实现的。词汇手段主要包括两种：词汇复现和词汇同现。词汇复现是指原词、同义词、近义词等的反复出现；词汇同现是指与某一话题有关的词语的共同出现。从主语连续省略、间隔省略和错杂省略三种形式的分析中可以看出，词语的复现、同现把前后存在有主语省略的分句联系起来，表明前后各分句具有相同的主语；词汇手段使文章前后联贯，而不致产生误会，它是主语省略得以实现的前提条件，也是先秦汉语主语省略如此之多的根本原因 This article explores the rules of omission of Chinese Subjects in Pre-Qin. Studies show that most of the pre-Qin Chinese subjects are achieved with the aid of lexical means. Vocabulary means mainly include two kinds: vocabulary reproduction and vocabulary co-occurrence. Recurrence of words refers to the recurrence of original words, synonyms, synonyms, etc. Synonym of words means the co-occurrence of words related to a certain topic. It can be seen from the analysis of three kinds of omission, interval omission and omission omission of the subject, the reappearance of the word is connected with the clause with omission of the subject before and after, indicating that the front and back clauses have the same subject; the vocabulary Means to make the article consistent before and after, without causing misunderstanding, it is a prerequisite for the omission of the subject, but also omitted so many root causes of Qin Chinese subject