Abstract: The alfalfa of“Zaxuan No.1”is a new breeding strain of Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, which is a drought endurance and high yield of a new strain alfalfa, suitable for growing cultivation in the semi-arid and semi-humid regions of Gansu and similar areas in Loess Plateau. The new strain breeding exhibited good production performance under dry farming condition in Gansu. The regional trial results showed that the average fresh yield of a new strain alfalfa was 46117.78kg/hm2 in Tianshui, Lanzhou and Dingxi, increased by 11.42% compared with control alfalfa of Zhonglan No.1 (Medicago sativa L.), higher than the control alfalfa of Juren (Medicago sativa L.) 22.35%, and higher than the local alfalfa of Tianshui or Longzhong (Medicago sativa L.) 28.82%.The average dry yield of new strain was 12257.89kg/hm2，increased by19.40% compared with control alfalfa of Zhonglan No.1, higher than the control alfalfa of Juren (Medicago sativa L.) 23.54%, and higher than the local alfalfa of Tianshui or Longzhong 24.40%.It’s seed yield was 371.35kg/hm2,lower than the control alfalfa of Zhonglan No.1 8.95%, higher than the control alfalfa of Juren 11.85%, and higher than the local alfalfa variety of Tianshui or Longzhong 16.11%..