Polyacrylamide(PAM),as a new effective soil amendment,applied on to soil surface,can significantly reduce runoff and erosion.With a series of rainfall simulation tests,effects of slope degree,slope length,PAM coverage and rain intensity on soil sediment loss of steep cultivated slope land are approached.The experiment is designed to have 3 levels of rain intensity:50 mm h^-1,100 mm h^-1 and 150 mm h^-1;4 slope degree:5°,10°,20°and 25°(8.74%,17.63%,36.4%and 46.63%);4 equivalent slope length:8 m,16 m,24 m and 40 m;and 5 treatments:control,straw coverage,3 PAM coverage-A,B and C(A