Japanese na-adjectives is always a controversial object in grammar field,in it the na-adjectives composed of two Chinese characters acccounts for a large proportion and because of its close relationship with nonu and adjective in morphology and syntax function,it is necessary to make a detailed analysis.This paper uses the corpus research method, chooses 50 words which have the top frequancy na-adjectives as the research object,and analyzes their typical features including noun,na-adjectives,the third adjectives.Accourding to the features to develop the stand and of three categries.The paper divides the na-adjectives composed of two chinese characters into six categories and analyzes the internal continuty of na-adjectives.What’s more, on the basis of the former-related research ,it puts forward that nonu,na-adjectives ande the third adjectives are a continuous developing route.Na-adjectives both has the feature of nouns and the third adjectives,due to it is located in the middle of noun and the third adjectives.