Abstract: Mastering the effects of weeding measures on the surface runoff and nitrogen (N) and phosphorus (P) loss in Torreya grandis plantations could provide a certain basis for the management of Torreya grandis forest land. Four runoff plot treatments were set up in Torreya grandis plantations at Dongyang Forestry General Farm, Zhejiang Province, including the young forest-weeding, young forest-control, middle-aged forest-weeding, and middle-aged forest-control. The surface runoff volume in 2024 was comprehensively monitored, the 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 as follows: young forest-weeding ＞ young forest-control ＞ middle-aged forest-weeding ＞ middle-aged forest-control. The average annual surface runoff in young Torreya grandis forest was about 3.4 times that in middle-aged forest. After implementing the weeding measures, the annual N and P loss amounts in young Torreya grandis forests increased by 4.6% and 5.9%, respectively, compared with the control group, while those in the middle-aged Torreya grandis forests increased by 9.7% and 3.6%, respectively, compared with the control group. The average nitrogen and phosphorus loss amounts in young forests were 3.5 and 3.6 times those in middle-aged forests, respectively. In conclusion, the surface runoff and N/P loss amounts in young Torreya grandis plantations were significantly higher than those in the middle-aged plantations. The mechanical weeding had little impact on soil N and P loss in Torreya grandis plantations, which could be promoted and applied in production in the future.