By observing the microstructures and measuring mechanical properties of three kinds of Mg-6Zn-XMn wrought magnesium alloys, the effects of Mn content on microstructures and mechanical properties of Mg-Zn-Mn magnesium alloy was studied. The results show that Mn element distributes dispersively in the matrix mainly as pure Mn particles which can hamper the grain growth, i.e. the grains become finer with Mn content increasing. Mn content has a certain impact on the yield strength of the three alloys, that is, the yield strength increases with Mn content increasing, and the increment of the extruded and the two-stage aged alloys are 14% and 5%, respectively. On the other hand, Mn content has no obvious effect on the tensile strength and elongation of T6 and T4+2-stage aged alloys. The alloy with 0.68wt% Mn after two-stage aging has better overall mechanical properties, whose tensile strength is the highest, 360 MPa, and whose elongation is 5.2%