Abstract: Water environment has become a main factor influencing the economy development in the south of Jiangsu Province. In order to achieve the integrated development in economy and environment protection the implementation of total quantity control of pollutant discharge is important. Based on abundant investigation about the load of water pollutants, the situation and function of water environment, in consideration of the hydrological character and the draining plan of the area, the authors analysed the amount of water pollutant discharge in this area and figure out the amount of water pollutants reduction in this area according to the concentration handle plan about water pollutant. Then,the application of the water quality model about river networks to predict the improvement of water quality after reduction is being made. Regarding the result as nature value and the function district of water environment protective goal in lower reaches of river as controlling demand, the authors deduce the maximum capacity for water pollutants if concentrative handle all rivers in this area. After scientific calculation it was got that the maximum capacity of containing water pollutant is 19.8 t/d, it makes economical scale limited and strongly influences the economic development of this area. The authors put forward some approach to expand the capacity of containing water pollutants and suggest to build a special channel to make polluted water flow into the Yangtze River.

Key words: amount of reduction, total quantity control of pollutant discharge, water quality model about river networks, waste water, channel linking the Yangtze River