Abstract: The experimental device of flowage and heat exchange in municipal secondary effluent heat exchange was introduced, which was built to research on the heat transfer performance, fouling and corrosion behavior of a municipal secondary effluent plate heat exchanger. With the indirect reclaimed water source heat pump system, which utilizes the secondary effluent from Qinghe sewage treatment plant in Beijing as the heat source, the experimental decice can offer the application and improvement of the municipal secondary effluent source heat pump. After testing, this system is previous enough in experimental scope.