Abstract: There is a remarkable function on decreasing runoff and sediment in seabuckthorn and its mixed stands, but the effects on soil and water conservation are different due to different structure and patterns of seabuckthorn and its mixed stands. The intensity of soil water use by seabuckthorn forest was different along with the month in growing season. In growing season, soil moisture in 0～500 cm layer was 5.1%, the lowest in the end of May and 8.8%, the highest in the end of October.This intensity was also different with forest age. 8 ages seabuckthorn forest consumed 231.2mm of soil stored water in 0～500cm layer annually, and soil moisture was 5.6%. Therefore, it should be cut for increasing soil moisture. In end of the third year after cutting, soil moisture in0～160cm layer could recover,and the value would be 10.3%～14.6%. Seabuckthorn forest could reduce the effect of slope location on soil moisture.Seabuckthorn and its mixed stands have similar intensity of soil water use,and there was a soil dry layer phenomenon in their stands.

Key words: partial factor productivity., Weibei Plateau, wheat yield, soil physical properties, dark loessial soil