The soil erodibility characteristics of four land use types in Yanqing County of Beijing City,such as agricultural land,Prunus armeniaca,Cupressacea,mixed forest of trees and shrubs,was studied by measuring and analyzing the characters of soil water-stable aggregates,organic matter content and the soil erodibility K value.The results showed that structural damage rate was followed in the order:agricultural land Prunus armeniaca > Cupressacea > mixed forest of trees and shrubs,and forestlands were significantly lower than agricultural land(p < 0.05).Soil organic matter content with the increase of soil depth has certain rising trend in the agricultural land,soil organic matter content with the increase of soil depth decreases in the forestlands.Different land use types have the K value differences,which was followed in the order:mixed forest of trees and shrubs< Cupressacea < Prunus armeniaca < agricultural land.The K value of surface soil (0-20 cm) was less than that of 20-40 cm deep soil,indicating that the soil resistance to erosion capacity was above the deep soil and it is important to protect the surface soil. The soil erodibility K value was closed related to the factors:such as soil clay content,organic matter content and soil water-stable aggregatest closely(p < 0.05).