Abstract: The plantations of Shuangfeng Mountain national forest park were classified with SPSS software by tree IV value and Pearson correlation coefficient and further the species di versily of community was measured for ecological construction of national forest park. The plantations were classified into three communities which were Cunninghamia lanceolata community, Pinus massoniaina community and Cryptomeria fortunei+C. lanceolata community according to dorninant species principle. Among three communities, C. lanceolata community had more high species diversity. There was the highest species diversity in the shrub layer and the lowest one in the tree layer among three layers (tree, shrub and herb layer). However compared with zonal climax, these communities had few species and low species diversity, especially in tree layer. Methods, such as the interval cutting and introducing ornamental flower and tree, should be used to increase the species diversity of community and improve forest landscape.