The　A356　aluminum　alloy　treated　with　conventional　flux　purification　and　impurity　removal　flux　purification　was　refined　using　Al-Ti-B-RE　refiner.　The　aluminum　liquid　treated　with　impurity　removal　flux　purification　had　a　better　refining　effect,　with　a　reduction　in　grain　size　of　25.26%　and　a　significant　improvement　in　strength　and　elongation.　Due　to　the　higher　purity　of　the　aluminum　liquid　purified　by　the　impurity　removal　flux,　the　stability　of　the　refinement　effect　is　better　maintained　during　the　later　insulation　process,　providing　good　conditions　for　the　transportation　and　casting　of　the　aluminum　liquid.