Forest vegetation can ameliorate obviously eco-environment,prevent land deterioration,improve the content of soil organic matter and available N,K,and drop soil pH and bulk density,add remarkably the quantity of water aggregate( > 0. 25mm) and micro-aggregate( > 50Lm) of soil,which can make soil construction better,improve the capacity of providing nutrient and water,enhance the formation of clay and more solidity,increase soil ant-i erodibility and ant-i scourability and decrease effectively soil and water loss. Vegetation fertilized and ameliorated soil mechanism is a right direction of abiding feedback,long time and more benefits.