The hilly and mountainous area(altitude<1 500 m)of Sichuan Basin and its edge in upper reaches of Yantz River is main suitable region for economical plant as well as the most frequent region of human activity. The surface runoff and soil erosion are serious so long as the cover plant of soil in the region is destroyed. We have established sixteen trial plots(100 m~2 each) for surface runoff and soil erosion adjusted by weed control in two kinds of slope on peach and tea garden, and four treatments of weed control(Glyphosate,Gramoxone,Tillage, and Weed cutoff-CK) have been carried out for four times a year. It has been conducted for one year.The results are as follows: (1)Soil erosion and nutrient loss by surface run off in weed control trial plots is Tillage>Glyphosate>Gramoxone>Weed cutoff(CK).(2)Amount of soil erosion in weed control trial: Soil erosion for Glyphosate, gramoxone and Weed cutoff(CK),compared with Tillage, reduced by 61.7%,67.6%,85.7% and 12.6%,24.2%,50.4% on 25°and 10°slope peach garden, 71.2%,84.3%,89.3% and 16.2%,52.3%,82.8% on 18°and 8°slope tea garden,respectively.(3)Nutrient loss of N,P,K,OM for Glyphosate application,compared with Gramoxone, increased by 19.9%,9.2%,23.3%,15.4% and 16.2%,15.3%,17.0%,20.6% on 25°and 10°slope peach garden, 89.6%,90.7%,80.0%,106.6% and 85.1%,81.4%,76.2%,83.9% on 18°and 8°slope tea garden,respectively.(4)The biomass、cover degree on trial plots: The biomass of weeds for Glyphosate, Gramoxone and Tillage incomparison with CK is 16.0%,60.0%,75.0% and 5.9%,43.9%,79.5% on peach and tea garden, respectively.The cover dgree of weeds for Glyphosate, Gramoxone,Tillage and CK is 40%,80%,65% and 95% and 25%,80%,95% and 95% on peach and tea garden,respectively.