Engineering measures, and reasonable and stereoscopic collocation of shrub-grass vegetation were performed over on large tracts of barren hills and slopes. The results showed that in the forth growth year, the root system of Prunus davidiana reached 320~360 cm deep, soil water content in the soil layer 0~500 cm deep decreased by 2.1%~3.3% compared to that before reforestation and the thickness of dry soil layer was 150 cm. And in the eighth growing year, the roots distributed as deep as 480 cm, the dry-layer reached 300 cm in thickness, the lowest and highest soil water content was 4.2% and 8.4% respectively. And in the twelfth year, the dry soil layer became very distinct, reaching 350 cm in thickness, and, especially in the 50~400 cm soil layer, the lowest and highest soil water content was 5.0% and 8.6%, respectively. While in the sixteenth year, the dry soil layer distributed in the depth of 50~350 cm, and its thickness was 300 cm, with the lowest and highest soil water content reaching 4.3% and 6.6%, respectively. But by building leveled terrace fields, contour ditches and fishscale pits, soil water content increased by 0.7%~6.3% in the depth of 0~100 cm, 0.6%~4.6% in 100~300 cm and 1.4%~4.6% in 300~500 cm compared to that in the barren hill, respectively. It showed that applying reasonable combined measures plus afforestation could regulate soil moisture region with significant effect.