Abstract: In order to study the effect of titanium (Ti)content on the wear resistance and corrosion resistance of forged Mg-6Al-4Sn magnesium alloy for mechanical shell and optimize the titanium content in Mg-6Al-4Sn-Ti magnesium alloy, the forged Mg-6Al-4Sn-xTi (x=0, 0.1, 0.2, 0.3, 0.4, 0.5 (wt%))magnesium alloy samples were prepared, and the microstructure, wear resistance and corrosion resistance of the alloy were tested and compared.The results show that the alloying element Ti is helpful to refine the grains of Mg-6Al-4Sn magnesium alloy and improve the wear resistance and corrosion resistance of the alloy. With the gradual increase of alloy element Ti content from 0 to 0.5%, the alloy grains are refined first and then coarsened, the wear volume decreases first and then increases, the corrosion potential first moves positively and then negatively, and the wear resistance and corrosion resistance first improve and then decrease. Compared with those of forged Mg-6Al-4Sn magnesium alloy without Ti, the wear volume of forged Mg-6Al-4Sn magnesium alloy with 0.3% Ti decreases by 21% and the positive shift of the corrosion potential is 13%.The content of alloying element Ti of forged Mg-6Al-4Sn-xTi magnesium alloy is preferably 0.3%.