Abstract: The as-cast Mg-4Zn-1Mn-0.5Ca alloy was hot-extruded into rods at 300℃, and the rods were subjected to aging treatment at 180 ℃ and equal channel angle pressing (ECAP) at 200 ℃. The microstructure and properties of the hot extrusion alloy, ECAP 8-pass alloy and ECAP 8-pass alloy after aging were studied.Subsequently, the samples were subjected to uniaxial tensile at room temperature and 150 ℃. The results show that the grain structure of the alloy after 8 passes of ECAP is finer and more uniform than that of the hot extruded alloy, and the yield strength of the alloy at room temperature is improved.The 150 ℃ elongation at break of the aged alloy after 8-pass ECAP is 17.4% higher than that of the unaged ECAP 8-pass alloy, which indicates that the aging treatment plays an important role in the properties of the alloy.