Eco-compensation is an important countermeasure for the control of trans-boundary pollution. In this paper, a district was chosen as eco-compensation subject and its responsibilities were determined through examining the water quality in trans-boundary water bodies. The calculation method of eco-compensation based on pollutant flux was established for adjacent districts. Taking Qiantang River Watershed as an example, the water pollution compensation of the watershed was calculated based on the COD concentration of 2004 and hydrological condition of 75% confidence. The results showed that the amount of eco-compensation reflects the characteristics of watershed pollution. Most upstream districts were acceptors of compensation, while most districts whose pollution was structural pollution were payers. The amount of compensation paid by some districts may exceed the level of local economic development, implying that the development may not be sustainable. Furthermore, the model of eco-compensation in Qiantang River Watershed including financial support, project support and technical support were discussed. It may be concluded that the eco-compensation will inspirit environmental protection in a watershed.
watershedeco-compensationpollutant fluxQiantang River