This paper probes into the conceptual metonymy in Chinese and its major influence over studies on Chinese grammar.First of all,a number of concepts are reviewed,including rhetoric metonymy,conceptual metonymy,and grammatical metonymy.Secondly,provided that grammatical analysis aims to reveal the relation between the form and the meaning of language,the introduction of a theory of cognitive metonymy is exemplified to be conducive to the explanation of the complex mappings between grammatical forms and grammatical meanings;in addition,examples are also used to show that,taking into consideration the metonymic use of words,we are enabled to obtain a deeper and thorough understanding of the distorted or skewed relations between the typical properties of lexical items and their relevant syntactic performance.Thirdly,it is also pointed out that,in explaining sentences like Tā(de yōngrén)shìRìběn nǚrén(His[servants]is a Japanese woman),a theory of metonymy is more applicable than a theory of ellipsis;furthermore,a number of metonymy-induced asymmetrical phenomena between syntactic structures and semantic interpretations are also explained in terms of reference from a theoretical perspective of the"role and value"of reference.Finally,it is exemplified that conceptual metonymy exists everywhere from grammar to rhetorics;therefore,language research cannot ignore the elephant in the room-metonymy.