Abstract: 【Objective】 To explore the effects of different irrigation quotas on alfalfa and evaluate the appropriate irrigation quota. 【Methods】 Taking alfalfa with shallow-buried drip irrigation as the research object, five levels of irrigation quotas (581,506,431,356,281 m³/hm²) were designed, and the ground irrigation CK ( 469 m³/hm²) was used as the control. Afterwards,the effects of different irrigation quotas on the growth, yield and water use of alfalfa were studied. Meanwhile, the entropy weight-TOPSIS comprehensive evaluation method was used to optimize the irrigation quota suitable for shallow-buried drip irrigation of alfalfa in this area. 【Results】 The plant height, stem diameter, yield and water consumption of alfalfa increased with the increase of irrigation quota in an appropriate range, and the difference was significant (P<0.05). However, excessive irrigation had no significant effect on the increase of plant height, stem diameter and yield of alfalfa (P < 0.05). Water use efficiency (WUE) and irrigation water use efficiency (IWUE) gradually decreased with the increase of irrigation quota, and the water consumption between stubbles showed the second stubble > the third stubble > the first stubble (P < 0.05). 【Conclusion】 The irrigation quota is 506 m³/hm², so it is strongly recommended this quota.