China’s rapid socio-economic growth has contributed to water scarcity and river pollution. Point sources of nutrients play a dominant role in this pollution. Animal manure from industrial farms is often discharged to Chinese rivers as point source. . Rivers export nutrients to Chinese seas. The nutrient pollution in Chinese waters increases the risks for eutrophication in ecosystems and decreases the availability of clean water for society. This project aims to improve our understanding of the impact of point source pollution in river systems on ecosystems and society, and to explore the effective options to reduce this impact in the future. This will be done via developing a multi-scale modelling approach to assess the environmental impacts on biophysical scales and effects of environmental policies on administrative scales. The existing MARINA model will be used as a starting point.