A conservation tillage experiment was carried out in the sloping fields in Chongqing in order to explore the influence of conservation tillage on water loss and soil erosion, so as to provide some suggestions for soil and water conservation in Chongqing area. The field experiment was carried out in 2015 in Shizhu, Chongqing. The flue-cured tobacco variety Yunyan 87 was planted in the whole testing area, and sloping ridging was used. There were four treatments, i.e. T1, in which Lolium multiflorum Lam. was not grown, T2, in which L. multiflorum was grown between ridges, T3, in which L. multiflorum was grown on the rdiges, and T4, in which L. multiflorum was grown both between ridges and on the ridges. The results showed that growing L. multiflorum between ridges could effectively reduce runoff by 58.66% to 65.79%, sediment yield could be reduced by 62.50% to 68.78%, and the loss of NO3--N, NH4+-N, phosphorus and potassium in runoff could be reduced by 52.05% to 57.22%, 51.03% to 59.98%, 51.47% to 65.88%, and 66.93% to 69.33%, respectively. When L. multiflorum was grown on the rdiges, the runoff, the sediment yield, the loss of NO3--N, NH4+-N, phosphorus and potassium in runoff could be reduced by 54.32% to 61.59%, 52.95% to 62.98%, 63.73% to 77.49%, 59.12% to 67.81%, 62.84% to 76.22%, and 75.17% to 77.84%, respectively. When L. multiflorum was grown both between ridges and on the rdiges, the runoff, the sediment yield, the loss of NO3--N, NH4+-N, phosphorus and potassium in runoff could be reduced by 92.09% to 98.25%, 86.43% to 95.91%, 87.89% to 94.99%, 90.19% to 97.06%, 81.99% to 91.94%, and 91.52% to 93.88%, respectively. Overall, growing L. multiflorum both between ridges and on the rdiges is the best way of soil and water conservation.