The paper investigated the microstructure of the semi-solid magnesium alloys by casting-rolling.The experiment of the casting and rolling of semi-solid Magnesium alloy was carried out on the equipment made by ourselves in our laboratory.It was found that casting and rolling have a remarkable effect on the microstructure of semi-solid Magnesium alloy.The slurry was gotten by the mechanical stirring before casting and rolling in which the first crystallized particle was not regular and remain the dendritic sh...