Abstract: The growth law of basic area of Glyptostrobus pensilis population in Pingnan was studied by the methods of Logistic Model.And a new model was optimized from the modified simplex method.The optimized results showed that the Hong-Logistic Model was more suitable than other models to simulate the actual growth trend of G.pensilis population.The residual sum of squares was 1.7831,and the intrinsic growth rate was 0.7604,and the Tr value was 1.3116 diameter class year.The highest growth rate of basal area was the eighth age classes,namely the phase when breast diameter was 48-54 cm,and the basal area reached 58.1991 m²/hm².It is thus clear that the growth of G.pensilis population was retarded,and it need long time to recover after suffering damages.The results would provide a theoretical basis for the protection and management of natural G.pensilis population in Pingnan.