High-temperature hot deformation experiments were conducted on the extruded alloy Mg-7.8%Li-4.6%Zn-0.96%Ce- 0.85%Y-0.30Zr at T=250-450 °C and strain rates of 0.001-10 s-1 using a Gleeble 3500 machine. The stress-strain curves of the alloy were analyzed. The curves show the characteristics of dynamic recrystallization, which is the main softening mechanism during the hot deformation processing. The peaks of the stress-strain curves become higher as the temperature decreases and the strain rate increases. The rare earth phase compound and α phases promote the dynamic recrystallization of β phases and slow down the dynamic recrystallization of α phases. In the process of the hot deformation, the dynamic recrystallization conducts quickly, the critical strain is lower in the stress-strain curves and dynamic softening covers the strain hardening effect