Abstract: To provide a basis for the management of Torreya grandis plantations, this study investigated the effects of weeding measures on surface runoff and nitrogen（N）and phosphorus（P）loss. Four runoff plot treatments were set up in T. grandis plantations at the Dongyang Forestry General Farm, Zhejiang Province: young forest - weeding, young forest - control, middle - aged forest - weeding, and middle - aged forest - control. Surface runoff volume in 2024 was comprehensively monitored, concentrations of different forms of N and P in runoff water were analyzed, and N and P loss amounts were calculated. The results showed that the order of surface runoff volume and N/P loss amounts was: young forest - weeding ＞ young forest - control ＞ middle - aged forest - weeding ＞ middle - aged forest - control. After implementing weeding measures, annual N and P loss amounts in young forests increased by 4.6% and 5.9%, respectively, compared with the control, while those in middle - aged forests increased by 9.7% and 3.6%, respectively. Surface runoff volume and N/P loss amounts in young forests were 3.4, 3.5, and 3.6 times those in middle - aged forests, respectively. In conclusion, surface runoff and N/P loss amounts in young T. grandis plantations were significantly higher than those in middle - aged plantations. Mechanical weeding had little impact on soil N and P loss in T. grandis plantations and can be promoted in production in the future.