Abstract: Detailed analysis of the material-flow structure and recycling efficiency was conducted based on analysing the nitrogen cycling in Dangji Ecological Farm.The results showed that the farm has established an initial system of material-flow structure of plantation,forestry,poultry,stock-raising and fishery.Within the system,the nitrogen output-input ratio between organic nitrogen and inorganic nitrogen is 1.19,system stable index is 0.980,nitrogen conversion efficiency of secondary production reaches 19.94%.The total recycling nitrogen from waste organic material reaches 11934.5 kg. Based on the potentials of nitrogen utilization and the state of material flow,measures for raising nitrogen conversion efficiency and enhancing whole system's stability were put forward.