Abstract: This paper,by taking Quercus engleriana,Betula albo-sinensis,Abies faxoniana and Fargesia rufa in the vegetation restoration pattern area of Beichuan Nature Reserve as objects,studies were made of the biomass models of the four species as well as the biomass distribution law of single plant and growth rule of every organ. The result has indicated that in the compositions of all of the species,the proportions of truck biomass are the highest,those of leaves are the lowest and the biomass ratios between branches and roots vary depending on species; In the comparison of correlativity between the proportions of biomasses of all nutrition organs and biomass of single plant,and the relations are significant in general,the tree trunks are positively related while the roots are negatively related; proportions of dry biomasses of all species are significantly and negatively related to the proportions of leaf and branch biomasses while the biomass of leaves is significantly and positively related to the biomass of branches.