Abstract: Unidirectional and multidirectional forging of extruded Mg-5Li-3Al-2Zn alloy were conducted, and the microstructure of extruded and forged alloys was studied by OM, SEM and XRD. The microhardness of the alloy before and after forging were tested. The results show that the extruded Mg-5Li-3Al-2Zn alloy is composed of α-Mg and Al Li phases,the grains are equiaxed but the hardness of the alloy is relatively low. After unidirectional forging, the Al Li phase redissolve in the matrix,recrystallization occurs during forging and the grains are refined. The initial deformation is mainly coordinated by twin, but the recrystallization is the main one in the later stage of forging, and the hardness of the alloy increases with the increase of accumulated deformation. When the cumulative deformation of multi-direction forging reaches about 1, the alloy is recrystallized completely and the hardness is the largest with the increase of the deformation, the grains gnow, and the hardness decreases.