According to the annual administrative reports of 8 tributary of the Yellow River from Hekou to Longmen,the data of round number sampling in 1985,detail survey in 1989,land use change survey in 1996 and two-stage sampling in 1997,and combining with acceptance check material of the first and the second period national main harness area in the basin of Sanchuan river, the preservation ratio of the water and soil conservation measures and its distribution have been analysed and determined. This work have made a good foundation for the calculation of benefits soil and water conservation measures on large area.