Organic pollution and eutrophication of Dianchi Lake are getting aggravated as a result ofurban domestic sewage.In order to better understand the trend in water pollution of DianchiLake，such main factors reflecting the organic pollution and eutrophication of Dianchi Lake as COD，ON and TP are predicted by means of a multivariate linear regression and "Ken Koda"Model，and by allocating the pollution loads to each point source.In addition，the active roleplayed by the wastewater treatment plantin control lingur bansewageis quantitatively expounded to provide a scientific basis for the control of water pollution in Dianchi Lake basin.