Based on four large-scale censuses of pollution sources in 2007, 2009, 2011 in Jiangsu Province, selecting pollutant discharge rule of chemical oxygen demand(COD)and ammonia nitrogen(NH₃-N)as the research object, the pollutant discharge tendency in Taihu Lake Basin in 2007, 2009-2011 is fixed out. According to the defined allowable permitted assimilative capacity and the controlled discharge volume for point pollution source, the cut rate for the total volume was derived. Results indicate as follows: (1)the total discharge volume of pollution declined in Taihu Lake Basin of Jiangsu Province in 2007, 2009-2011. The proportion of urban point-source declined while the proportion of non-point source had the tendency of rise; (2)The export load of COD and NH₃-N in Taihu Lake Basin of Jiangsu Province should be decreased by 20% and 65% in the research area during the twelfth-five-year period; (3)the cut rate of point source discharge volume of COD and NH₃-N should be 27% and 35% in the research area in the twelfth-five-year period.