With the original vegetations kept undisturbed,the field double-ring method was used to examine soil infiltration under 4 different patterns of land uses (P-1,waste grassland with active gullies,P-2,waste grassland with stable gullies,P-3,bare land with active gullies,and P-4,farmland) in gully erosion area of Anning River Valley of the Jinshajiang River Basin of Xichang,Southwest China.Results showed P-2 was the highest in average infiltration rate in the initial 21.5 mins and in cumulative infiltration and P-3 was the lowest with the others standing in between.The process of infiltration under 4 different patterns of land use can be described with the equation of костяковА.Н:f(t)=at^-b.Vegetation could increase the soil organic matters effectively,and the latter could improve soil structure notably.The higher content of water-stable aggregates > 0.25mm,especially of aggregates > 3mm increased soil infiltration rate.Root weight is an important biological indicator of soil infiltration.High soil infiltration reduces surface runoff and hence in turn suppresses formation of gullies.