本文从语言类型学以及篇章语法的视角出发,明确汉语关系从句的小句地位,通过汉语关系从句来验证Du Bois(1987)提出的优先论元结构假设(PAS)。研究发现,汉语关系从句中不及物主语关系从句和直接宾语关系从句基本遵循PAS,而及物主语关系从句违背PAS的制约。本文从语体因素的角度对汉语关系从句论元结构的语篇表现进行了解释,认为书面语体信息压力值较高和及物主语关系从句的低及物性特征导致其对PAS的偏离。 From the perspective of linguistic typology and discourse grammar, this paper clarifies the clausal position of Chinese clauses and verifies the presumed structure of hypotheses (PAS) proposed by Du Bois (1987) through the Chinese relation clauses. The study found that in the Chinese relational clauses, the subject clauses and the direct object clauses basically follow the PAS, while the clauses of the subject clauses violate the PAS. This paper interprets the discourse performance of Chinese relational clause structure from the perspective of stylistic factors, and concludes that the pressure value of written language information is high and the low and physical characteristics of subject clauses lead to its deviation from PAS.