Abstract: "m∂³³" is the only commonly used negative adverb in the Naxi language.It can be translated to "bu、mei、wei、wu" and so on.Its basic expression function is to negate the truth,accuracy and relevance of the thing,the movement,the nature,the relations and so on."m∂³³" as the particular negative adverb of Naxi language seems very simple in usage,but is very complicated in the light of syntactic function and language use and many problems remain to be solved.Therefore,this paper makes exploration and analysis of the usage of negative adverb "m∂³³" according to the materials of Naxi Dongba scripture and modern Naxi spoken language.