Abstract: Slope water edge effect in loess gully area in western Shanxi province was studied.The results as follows：first，the soil water content of slop farmland in 5 m edge space is higher than in 2 m edge space and the edge part，and the soil water content in 2 m edge space is similar with edge part.Second，the difference of soil water content between edge，middle and root part is not obvious in bench step land of 0～100 cm，but the difference is obvious in 100～200 cm，root water content than the middle part and the edge part respectively higher 18% and 68%.Third，25 cm edge space water content of scale pit in 0～100 cm layer is obviously higher than 2 cm edge space.This study could be served as guidance to ecological construction.