Abstract:Runoff pollution is a critical issue that affects urban water environment. In order to solve this issue, research has been conducted in the fields of runoff pollution source analysis and measurement, inspection and accurate diagnosis of pipeline defects, trenchless pipeline rehabilitation, and systematic polution control technologies. A series of technologies and equipments are developed in this project, breaking through the technical barrier in the quality improvement of drainage system in high-density build-up areas. The research achievements have been applied in Fuzhou, Xiamen, Shanghai and other cities, achieving good environmental and social benefits. These technologies can provide important technical support for the improvement of urban water environment in China.