Abstract: This article took the Jiangxi Jinggangshan National Nature Reserve of Castanopsis fabric as the research object,through the use of typical sampling,each wooden foot and trunk analysis and other methods,to undertake preliminary study of Castanopsis fabri growth and biomass allocation pattern.The results showed that,at two Castanopsis fabri growth periods:0-10a,30-40a,DBH growth in successive years was rapid,the peak of 0585cm.DBH of 60a reached 272cm.Castanopsis fabri tree height growth in 30a to 980m,become the dominant tree;Castanopsis fabri volume in 0-20a was slow growth,yet 20-60a has been a rapid growth phase,annual growth volumeof 60a to 00226m3.Castanopsis fabri average growth rate and the annual growth volume curves did not intersect,indicating that Castanopsis fabri of 60a also did not reach maturity age.The growth of Castanopsis fabri was divided into 3 periods:0-20a for the juvenile stage，20-50 a for a fastgrowing period,50-60a for strong age.