The total idea for waste water controlling was described and then the emission concentration limited of the chemical oxygen demand（COD）and the ammonia nitrogen（NH3N）for the Jinsha River, the Luanhe River and Dalinghe River were calculated respectively by twodimensional water quality model. The results show that the COD emission concentration limits of the three rivers were under the current standards. However, the NH3N emission concentration limits were all closed to or above the standards; the recommended COD and NH3N emission concentration limits were no more than 60 and 15 mg/L, respectively.