Based on the test conduted in smi-arid area of loess hilly region.the southern Ningxia,the water use of crop in man-made terrace and slope land was analyzed It shows that, the change of crop production and water use efficiency is smaller in terrace,either in full rainfall year or inshort rainfall year;but for slope land,it is greater.In terrace with highest fertility,the wateruse capacity is 328.0mm,its efficiency is 0.227kg/mm;but in slope land.under the samefertility condition,its figures are 262.0mm and 0 208kg/mm separately.The way out for in-creasing production fully in terrace is to increase the amount of fertilizer applying.