Abstract: This paper analyses the effect of water storage and soil moisture conservation by means of micro water collecting technology in the dryland field of spring maize. The results indicate that the rainfall infiltration depth is deeper by means of micro water collecting treatment than that of control. In micro water collecting treatment, the amount of soil water storage within 0～200 cm soil layer increases by 50.5 mm, 13.5～58.6 mm, and 24.5 mm during seedling stage, the critical stage of water requirement and harvesting stage respectively compared with the control. The micro-water-collecting technology has the function of regulating and adjusting the amount of field evapotranspiration , which results in an obvious effect of increasing crops yield , especially in the dry year. Micro-water-collecting technology can raise the water use efficiency.