HSPF (hydraulic simulation program - FORTRAN) model is a mathematical model developed by the U.S. Environmental Protection Agency (EPA). It is used for continuous simulation of hydrological and water quality processes in a large watershed under natural and artificial conditions. The model is written in FORTRAN language and based on Stanford hydrological model. It can comprehensively simulate runoff, soil loss, pollutant transport, river hydraulic and other processes, and is widely used in the scenario simulation of watershed water environment effects of climate change and land use change. The model is an excellent representative of semi distributed hydrological and water quality model, HSPF model is widely used in foreign countries. HSPF model includes perlnd, implnd and rchres to simulate the hydrology and water quality of permeable section, impervious section and surface water body respectively. Generally speaking, HSPF model plays an important role in the simulation of hydrology and water quality process in foreign countries, as well as scenario analysis involving climate change and land use impact, But the application of this model in China is very limited