In order to promote the development of grass industry in the drought-hit area, the construction of the animal husbandry base, and the development ecological agriculture, to select the species of artificial herb with high regeneration, high output and high WUE, the yield, the speed and the water use efficiency of re-growing hay of twelve alfalfa cultivars from domestic and aboard are studied in 2001 and 2002. The results showed that re-growing speed of all introductions in the 2nd harvest was higher than the local cultivar Hui'ning , most of introductions were higher than local cultivar in 3rd harvest. The yield of all introductions were higher than local cultivar Huining. Algoquin, Emperor, Cimmaron, Siriver, WL-323Ml have high re-growing hay yield, high WUE and strong regeneration.