Abstract: The paper aims to study the growth of non-dormancy alfalfa under high temperature and the effect of high temperature cutting time on regrowth yield and quality of alfalfa. 3 non-dormancy alfalfa varieties were cut in early and middle August by two-factor randomized block design. The results showed that: the growth of 3 alfalfa varieties‘( WL656’,‘WL712’,‘WL903’) was good under high temperature, their plant height and fresh weight increased significantly; 3 alfalfa varieties after cutting under high temperature could normally grow, but the air temperature of the cutting day could affect the growth of regenerated alfalfa; the alfalfa regeneration rate with cutting on August 1 and 5 was significantly slower than that on August 10 and 15; the trend of regeneration rate was basically the same among the varieties; the cutting time and the varieties had significant or extremely significant impacts on crude protein content, acid washing fiber content and neutral detergent fiber content of alfalfa. In conclusion, ‘WL656’, ‘WL712’and‘WL903’are heat- resistant varieties with good yield and quality in summer.