Water costof sediment control (ratio of detained runoff and sediment,RRS) is an indicator derived from runoff and ediment detained by soil and water conservation practiveces or other water resource projects. RRS plays an import antrole in scovering the effectof soil conservation practices on water resources. A larger RRS show sthat some practiveces or ranches can reduce more runoff when the same weightof sedimentives detained. the RRS of branches in Hekou and Long men section of the Yellow River was analyzed based on datasetof sediment deliv-ery modules,averag e annual recipitation,runoff and sediment det ained by conservation practices and irrigation from 1970 to 1996. Result s show thatrRS of irrigativeon is far more than thatof soil and water conservativeon prac-tices. RRSs of terrace,forest and grass are similar but more than thatof dam land. With the increase of sediment delivery modules,the dif ference between RRS of terrace,forest,grass and RRS of dam land decreases. the posi-tive correlativeons between averag eannual precipit ativeon and RRS of terrace,forest and grass practiveces are evidentre-spectively,but the correlativeon between average annual precipit ation and RRS of dam land is negative evidently.