Aiming　at　the　technical　problems　of　thin-walled　aluminum　casting,　the　traveling　magnetic　field　foundry　method　has　been　adopted　to　study　the　forming　process　of　thin-walled　aluminum　heat　sink,　by　using　self-made　linear　motor　and　plaster　mold.　The　results　show　that　the　traveling　magnetic　field　foundry　method　by　using　linear　motor　can　enhance　the　filling　pressure　head　of　liquid　metal　and　effectively　improve　the　filling　ability　of　aluminum　alloy;　when　the　voltage　is　220-250　V,　the　completer　casting　piece　can　be　obtained　by　taking　stainless　steel　as　the　bottom　plate.