In order to explore the effect of orchard weeding in summer on non-point source pollution of orchard, the loss of suspended solids(SS)and nutrients(TN, TP)in surface runoff was studied under three rainfall intensities(60mm/h, 120mm/h, 180mm/h)and two kinds of underlying surface(with grass and without grass). The results show that the mass concentration of TN and TP in runoff is linearly correlated with the mass concentration of SS, and the linear correlation between the mass concentration of TP and SS is stronger(R²=0.9215). Artificial weeding results in the increase of SS, TN and TP mass concentration in runoff, which cause the loss per unit area of SS, TN and TP increased by 30%-46%, 11%-29% and 11%-22%, respectively, especially in the later stage of rainfall. Therefore, the frequency of orchard weeding should be reduced during the rainy summer, especially during the rainstorm period.