The rainfall-runoff process and soil erosion quanti ty were researched by runoff experimental field in 2000. As a result silver chai n forest land has a better capacity in soil and water conservation than naked l and. It can reduce surface runoff than naked land when rainfall changes around 3 0mm. In 2000, 179.42 g/m~2 soil were lossed in silver chain forest land, 980.1 g/m~2 in naked land on the contrary. Along with the change of rainfall, soil erosion quantity in forest land is about 3~5 times than in naked land. Total soi l erosion quantity in forest land can be reduced 5 times compared with naked lan d.