Hydropower station construction in Southwest China and Yunnan Province has accelerated noticeably recently owing to the dominant position of hydropower development in China's energy development.But it also has prominent impacts on the ecological environment.Considering the construction features and man made soil and water loss

this article proposes that the“three(water

electricity

and gas) available and one flat(construction site flat)”stage and the time before dam pouring are the cxitical period of s oil and water loss.Dumpling piles and construction roads are the main sources of soil and water loss.Several control mean ures are also proposed

such as proper dumpling pile location

foundation treatment

runoff exhaust

spoil block

spoil platform

and slope management

as well as reasonable water cutoff and drainage on construetion roads

excavated slope stabilization

embankment protection

protection of lower slope

and appropriate vegetation.