Xishan small basin is located in the source of Pearl river,influenced by social and economic activities of man-kind,the eco-environment of it had been deterioated gradually.Through five years sustained construction,a comprehensive harness system has been set up,and the marked benefits of economy,ecology and society have been achieved by applying eco-economic principle and systematic project,adjusting constructure,utilizing natural resources fully.This is a good type for sustainable development of eco-economic system in mountain areas.