Soil erosion and water loss are two serious problems threatening the ecosystem and preventing the development of agriculture in the semiarid and arid regions.Polyacrylamide(PAM) can significantly amend the properties of soil.PAM, with high vicosity, can effectively improve the surface structure of soil, enhance the stability of soil, increase water infiltration and reduce soil erosion.The objective of this paper, with experiments conducted with rainfall simulator, was to determine the relations between soil erosion and applications of PAM under conditions of different rainfall intensities and slopes.Experiments showed that the soils treated with PAM had better infiltration and stability properties.With cohering significantly with particles of soil at surface, forming bigger aggregates and halting the formation of crust, PAM can provide erosion control and benefit infiltration.