The as-cast Mg-6Li-3Al-1Zn（ LAZ631） alloy was hot-rolled

and microstructure and tensile properties of the hot rolled plates were investigated by using OM

XRD and uniaxial tensile testing. The results show that the large deformation can be achieved by the hot rolling of LAZ631 alloy. With the increase of rolling deformation

microstructure of the alloy is refined. At a higher rolling temperature

parts of the Al Li phase can be re-dissolved into the matrix and the α phase is generated at the（ 0002） preferred orientation. The β phase is distributed in α phase with continuous tiny-line shape under the severe deformation. The tensile strength of the alloy is increased with increasing in the rolling temperature and the deformation as a result of the working hardening and microstructure refinement

and the maximum value reaches 312. 73 MPa. At a higher temperature

elongation of the hot-rolled alloy is decreased with the increase of the deformation

while at a lower temperature

the elongation is increased firstly and then decreased with increasing in the deformation rate

which can be attributed to the recrystallization of the alloy.