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The influence of Al alloying on the microstructures and the mechanical properties of Mg-xAl-1Sn-0.3Mn alloy sheets was investigated.The microstructure of Mg-xAl-1Sn-0.3Mn consisted of α-Mg and Mg17Al12 precipitates.Alloying with Al increased the amount of Mg17Al12 and the average grain size.Uniaxial tensile tests were carried out along the extrusion direction (ED),the transverse direction (TD) and 45° toward the ED.Mg-5Al-lSn-0.3Mn alloy sheet exhibited the best combination of mechanical properties along the ED: a yield strength of 142 MPa,an ultimate tensile strength of 282 MPa and an elongation of 23%.The good performance of Mg-5Al-1Sn-0.3Mn sheet was mainly attributed to the large quantity of Mg17Al12 precipitates and a weak basal texture.Annealing caused static dynamic recrystallization,refined the grain size and enhanced the mechanical properties: yield strength of 186 MPa,ultimate tensile strength of 304 MPa,elongation of 21% along ED.Both strength and ductility were enhanced by Al alloying.