Abstract: Water resources have become the limiting factor of grain production in the loess plateau. Currently, the rainfall use efficiency only amounts to about 35% in the farmland of the loess plateau, but researches indicate that the rainfall use efficiency can reach as high as 70%~80%. The paper expatiate up the technical approaches for exploiting and enhancing the Rainfall Potentials of Minor Crops in the Loess Plateau in accordance with improving internal community productivity, controlling the runoff discharge from slope land by farmland construction, inhibiting non-effective consumption of farmland water, enhancing the spatial enrichment of farmland water, and establishing the planting structure matching with rainfall.