Abstract: The effects of different rolling temperatures on the microstructure and mechanical properties of Mg-6Zn-0.8Y-0.3Zr alloy were studied by SEM, hardness test and tensile test.The results show that after rolling at different temperatures, the second phase of the alloy changes from strip and block to granular and small block, and aggregates at the grain boundary in a semi-continuous form.The grain size of 420 ℃ rolled alloy is uniform, and the fine granular second phase has the best dispersion effect.With the increase of rolling temperature, the hardness and tensile strength of the alloy first increase and then decrease.The hardness and tensile strength of the alloy rolled at 420 ℃ reach the maximum value, which is 71.2 HV and 278 MPa, respectively.