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为了解决干旱牧区苜蓿的雨水利用效率低的问题，通过对牧区苜蓿地块施撤保水剂增加雨水的利用效率。研究表明，使用保水剂后，苜蓿的生长株高和产量比对照组都有所增加，其中株高平均增幅为31．93％，产量的平均增幅为114．08％，雨水的水利效率也相应提高，平均株高和产量的雨水利用效率增长幅度分别为61．54％和131．5％。对苜蓿地块施加保水剂后，不仅增加苜蓿的生长高度，而且增加了苜蓿的生长密度。研究结果可为改善牧区生态环境，增加牧草产量提供理论依据。“,”In order to solve the problem about the inefficiency of rainwater utilization in the pasture area of north China, a field experiment was conducted for water retaining agents in the natural pasture to increase the rain water use efficiency of Medicago. The study results indicated that compared with unused water retaining agents treatment, the increment of height and yield of Medicago was distinct, the average height and yield of grazing was improved 31.9% and 114. 08%, respectively. The rainwater use efficiency of Medicago was increased too, the average height and yield of water use efficiency was improved 61.54% and 131.5%, respectively. Not only the height of Medicago, but also the growth density of Medicago was increased. The result of study may provide references for grassland to improve the environment and the yield of Medicago.