Abstract: On the basis of the investigations on flora, type of plant cover .forest resources and soil nutrients in the hilly land in Shanyi Village .the dynamic processes of soil mineralization, tree growth and hilly ecosystem were modelled. The annual variation trend in soil nitrogen content, the weight of fall leaves layer, the biomasses of herbs, bushes and trees, usable soil nitrogen, in hilly iand and mineralization rate and its variation of nitrogen, total biomass and its net increasing amount of the whole hilly system were predicted. It provides the scientific foundation for planning, development and management of hilly land of the village.