P load from cropland mostly is in the form of PP (Particulate P). The amount of TP (total Phosphorus) isn't high, but the concentration of DP and ortho-phosphrous should be noticed. Because the bimestrial rain from June to July in 2002, all forms of P of the sample gotten in the 4th, July 2002 are head and shoulders above other samples. After comparing the three different cultivates manner sections, we find some laws: the load of TP in runoff is diverse by cultivate manner sections. In instant rain, the amount of TP load with runoff is FT (Flat tillage)>DT (Down slope tillage) > RT (Ridge tillage): while in continuous rain is DT, RT>FT. On the other hand, there is the resemble relation between leakage P and rainfall, the correlative coefficient R~2=0.9232. In conclusion, the amount of total P load from agricultural system by NPS isn't high, but the environmental effects caused by DP should be paid attention to. The NPS P has less influence on ground water than surface water. The NPS P influences on surface water are potential, which will break out in the moderate conditions.