In order to get back the water function of irrigating and breed aquatics in Muguhu reservoir inch by inch,the paper presents a quantify discussion of the water environmental total capacity of the mostly pollutant in Muguhu reservoir,according to different irrigating period of time and water quality aim,educe the reservoir total maximum daily load(TMDL)in different irrigating period of time.

The Grey Forecast of Maximum Load and Peak-Valley Difference of Beijing,Tianjin and Tangshan Wire Netting;