江河流域面源污染负荷量是编制流域水资源管理及保护规划,采取污染防治措施的一项基础资料和依据。过去沿用的流域水文模拟,野外实测的方法,不适用于大面积的江河流域。近年来由于地理信息系统(GIS)的迅速发展和普及,结合面源模拟模型,可以估算出江河流域内各个地区的面源负荷量,本文介绍国外利用污染负荷筛选模型(PLSM)的一些情况。 Non-point source pollution load in river basins is a basic information and basis for the preparation of river basin water resources management and protection planning and pollution prevention and control measures. The watershed hydrological simulation and field measurement methods used in the past are not suitable for large-scale river basins. In recent years, due to the rapid development and popularization of geographic information system (GIS) and the non-point source simulation model, the non-point source load of various regions in the river basin can be estimated. In this paper, some situations about the foreign pollution pollution screening model (PLSM) are introduced.