Abstract: The root biomass and the annual root growth of Cryptocarya concinna, Lindera chunk community in Dinghushan Biosphere reserve were investigated by the method of soil columu. The nitrogen concentration of roots was determined by the automaticion analyzer(Quikchem R), and the nitrogen accumulation and dynamics of root pool were also estimated. The results shown that the root biomass(t/h)was 35.43 including live root of 26.63 and dead root 8.8;the annual root growth was 3.74t/h·a; the nitrogen storage in root pool was 279.23 kg/h (202.25 in live pool and 76.98 in dead pool); the annual root growth absorbed and accumulated 57.55 kg/h·a of nitrogen.The ratio of annual root growth and its nitrogen accumulation in total biomass and nitrogen storage of root pool appeared to be higher, they were 10.6 and 20.6 respectively. Therefore, it was considered that the Cryptocarya concinna, Lindera chunii community is in a vigorous stage of growth and development.