Through　a　new　multi-layer　electromagnetic　stirring　method,　effects　of　stirring　methods,　casting　temperature,　stirring　rate,　and　stirring　time　on　properties　of　semi-solid　Al-Zn-Mg-Cu　alloy　as　well　as　the　mechanism　were　investigated.　The　results　reveal　that　multi-layer　reverse　stirring　method　is　optimal,　and　the　optimal　process　parameters　are　casting　temperature　of　640　°C,　stirring　rate　of　3　000　r/min,　and　stirring　time　of　30　s,　where　semi-solid　slurry　structure　with　well　grain　size　and　morphology　can　be　obtained.The　flow　quantity　of　alloy　melt　is　increased,　and　the　uniformity　of　temperature　field　and　solute　field　are　improved　by　adopting　multi-layer　reverse　electromagnetic　stirring,　enhancing　the　disorder　level　of　alloy　melt,　and　improving　the　size　and　morphology　of　primary　phases.　©　2024　Journal　Office　of　Special　Casting　and　Nonferrous　Alloys.　All　rights　reserved.