Based on the achievements as well as theories and methods of the previous studies made on Shuowenjiezi and Zhuyuci,this paper attempts to compare the explanations of function words in both books and probes into the differences in terms,systems,examples,entries and methods of explanation,pointing out that Zhuyuci inherits and develops the achievements of Shuowenjiezi on function words and that some defects in their study on grammar and lexicolo...