Abstract: Control and management on cost of hydropower projects is an important step in project construction.Design run through the project during the whole construction stage.Joining and strengthening design work becomes the base of controlling project cost.Fully using the competitive mechanism of market value,do well in biding,selecting excellent construction company and rational contract cost will play the key roles in effectively controlling project.Meanwhile,to give full play to supervision works,strengthen field coordinating and managing will ensure to gain maximum profit after project completion.