Abstract: In view of the increasingly serious pollution of urban inland river，a diversion scheme was developed and the corresponding experiments were conducted by taking Huancheng Ｒiver in the old city region of Chaohu as the object． According to the hydrology and water quality，six water quality monitoring stations were set up and Huancheng Ｒiver was divided into five sections． Based on the data of the hydrology and water quality，estimates were made in loads of nitrogen pollutants at different time in the five sections． Then preliminary studies were carried out on the load regularity of NH3－N and TN in each section． By comparing the removal efficiency of nitrogen pollutant loads in sections of upstream and downstream，factors affecting water diversion were analyzed in combination with the actual situation． As for the deficiencies in water diversion，four optimization suggestions about the program were proposed． And the effectiveness of the most viable option in them was verified．