The water demand, total water demand and staggered water demand, which produced the seed grain of one kilogram with No. 1 of Avena nuda in the different output level during the couise of planting in Qaidam basin, was quantificau'onally studied by the statistic method. The relationship between the water demand and different output level were discussed, and the scientifically irrigative measure were taken. The result showed that ameliorating the cultivated measure, increasing fertilization, improving irrigative technology, etc should be the first primacy of basis on basically satisfying the water demand, not consist with improving the irrigative water demand of unit area in order to reach the high output level of 7000 - 9000 kilograms. Meanwhile, the period of two leaves and one center was the best irrigation phase in the young plant; during the middle phase, the period of polarization of gynoecium and androecium and connectives of anthers and overlay apparatus was better; while in the final phase, the water of building storeroom was irrigated enough at the base of irrigating the water of flowering.%应用统计学方法定量研究了青海莜麦一号在柴达木盆地种植过程中不同产量水平下生产1 kg籽粒的需水量、总需水量和阶段需水量,以探讨莜麦不同产量水平与需水量的关系、以及高产的科学灌溉措施.结果表明,要取得7000 ～ 9000 kg的高产水平,主要不在于提高单位面积的灌水量,而应在基本满足对水分需求的基础上,把改进耕作措施、增施肥料以及提高灌溉技术等放在首位；苗期灌溉最好是在二叶一心时期,中期在雌雄蕊分化期、药隔分化期和覆盖器官分化期灌拔节水效果都较好,后期一般在灌好扬花水的基础上、灌透建库水.
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