Abstract: The community selected from needie and broad-leaved mixed evergreen forest in Niumulin Nature Reserve Zone is analyzed on the basis of study on the floristic geographical composition，sectional structure and species diversity of the community．The results show that the flora of vascular plants contains 119 species and a number of 62 genera in 38 families in the plot with 600m²．Among the floristic geographical elements of seed plants，all sorts of tropical genera and temperate ones amount tO 37 and 19，making up 64．91％ and 33．33％ of all the 62 genera respectively．The community is with more and clearer layers and sublayers in the complicated vertical stratification，and the tree layer can be divided into 4 sublayers，and there are a large number of tree，shrub and liana in it，and the herb is lack of．The species diversity index order for different sections of the community is as follows：shrub layer>tree layer> herb layer> interstratum plant．