The synonyms"yinqi"and"yinfa"are similar in conceptual meaning,but there are many irreplaceable situations in usage.Simple explanation and example can not distinguish them well,and in-depth comparison is nee-ded to distinguish the differences between them.Based on the corpus,this paper examines the irreplaceability of"yinqi"and"yinfa"in syntax,and systematically summarizes the syntactic differences between them in terms of col-location and types of objects when they are used as predicates.This paper further explores the semantic differences between them,such as the differences in internal word-formation structure and the differences in semantic and gram-matical categories formed in collocation,so as to further reveal the interpretation of semantic differences to syntactic differences and deepen the understanding of this group of synonyms.