Natural resources in water, soil and air etc, lose their overall Lalance because of serious over-felling of forest，resulting in a bad influence on ecological environment. Results are as follows; the decrease of the volume of water flow, the obvious difference of the volume between flood and low water; the increase of the volume of sand flow,the bad loss of water and soil; the increase of the wind speed,the seriou drying of summer;the increase of accumulation of snow,the increase of pross under hailstone weather.at persent,