Abstract: Beyond the on-site negative consequence, soil erosion has off-site negative impacts as a result of sediment delivery. The spatial decoupling between soil conservation services provision and beneficiaries is common. In previous assessments involving soil conservation services, the on-site soil erosion prevention usually is used as proxy to the soil conservation services, or a constant sediment delivery ratio is employed in estimating sediment delivery to external areas. The former approach ignores the difference between provision of soil conservation service and soil conservation services delivered to beneficiaries, and lead to an overestimation. The latter approach overlooks the spatial variation of sediment delivery ratio, and leads to great uncertainty in soil conservation services quantification. It is fundamental to understand the process-effect-function-service cascade in estimating soil conservation services provision and delivery. Fortunately, spatially distributed sediment deliver model that integrated the sedimentological connectivity concept provides an opportunity. In this study, a spatially explicit approach based on the cascade mode of soil conservation formation was employed to assess the soil loss prevention and sediment reduction services in neighboring areas of Dongting Lake in Hunan Province. The supply capacity of soil loss prevention service and sediment reduction service are integrated. Following the framework of this study, that ecosystem services supplying areas are coupled with the beneficiary areas through the ecosystem services flow. This study shows an effective avenue to coupling the ecosystem service supply and demands.