Abstract: On the basis of orientutive observation made of the soil and water loss on 3 plots(terracedfield, Chinese fir plantation and bare spot), and the analysis of surface runoff water quality and soilcharacteristics, it is believed that building terraced field and planting trees on the sloping tillage fieldscan decrease not only the quantity of water and soil loss, but also the loss of nutrient matter from soil.The modulus of soil erosion on the horizontal terraced field and Chinese fir plantation are 2. 4% and4. 01% of bare plot. The index of surface run off on the former two sites will decrease by 57. 7% and67. 7% than that on the bsre plot. The loss of N. P. K and organic matter on the horizontal terracedfield is 67. 26%, 70. 4 %, 66. 4 % and 95. 57% lower than that on the bsre plot. and also the loss ofN. P. K and organic matter on Chinese fir plantation is 72. 07 %, 77. 02%, 43. 18% and 90. 7%lower than that on the bsre plot. Moreover, the time of surf see runoff on the horizontal terraced fieldand Chinese fir plantation is held up by 30 min as compared with bare plot. and the flowing quantityon the floodpeak will decrease 2 to 3 times.