The aim of this study is to assess the effect of vegetation restoration on soil erosion dynamic changes in recent years.Based on the uniform sampling(1%)

the impact factors of soil erosion were surveyed in 39watersheds in Wuqi County

Northern Shaanxi Province in 2009and 2011respecitively.With the comparison of land use interpreting result from 2009SPOT multi-spectral image

the accuracy of the sampling method

soil erosion dynamic changes and the impact factors were analyzed in Wuqi County.The results showed that:(1)The 1%uniform sampling ratio could well represent current situation of soil erosion in Wuqi County.(2)From 2009to 2011

the area of slight erosion increased significantly

while the proportion of moderate

intensive

extreme intensive and severe erosion has reduced in varying degrees.All the areas of intense erosion

extreme intensive and severe erosion decreased by more than 5%

while the erosion intensity varied significantly within the single watershed.(3)The main reason that causes soil erosion changes was the rainfall erosivity

which was smaller in 2011than in 2009.Compare to 2009

although the area of shrub land decreased

the area of grassland and all the other types of vegetation cover increased in 2011.Due to this

the soil conservation biological factor decreased

and the changes of other factors were small.