With little rain, high temperature and serious soil erosion, the dry and hot river valley has very low soil water, the serious soil drification, found in other regains, which is being confronted in the course of construction of artificial vegetation in dry and hot river valley. Through using different measure of engineering preparation on slope, micro-slope was reconstructed, rainfall infiltration was strengthened, the results showed ; after reconstructing micro-slope with contour trench and contour terrace, the soil humidity environment of contour trench, contour terrace and their close slope obviously improved ; the difference of soil water of contour trench, contour terrace and natural slope slowly decreases from summit to fOOt of hill in dry reason, and the biggest difference was found, in the middle slope in raining reason; the soil water of contour terrace in western slope was much greater than that of northern and southern slope; within certain slope scope, contour terrace of smaller slope has greater soil water; contour terrace with much sand soil has greater soil water; after reconstructing micro-slope with contour trench and contour terrace, the accumulation time of soil water increases, which will benefit to the using of vegetation.