Abstract: This paper takes Beichuan Nature Reserve as an example and uses gray correlation analysis and regression analysis method to analyze the biomass and impact factors of Quercus engleriana Seem,Betul a albo-sinensis,Abies fabri,Fargesia rufa.The results show that the outcomes are highly consistent based on two mathematical techniques,that is,elevation has the greatest relevance to the four vegetation types above,and each type of the vegetation biomass and elevation has obvious correlation to some extent,which can provide a scientific basis and reference for the restoration and reconstruction of vegetation in Beichuan Nature Reserve after the disaster.

Key words: biomass, vegetation, grey correlation, Beichuan Nature Reserve