An　effective　way　of　integrating　purification　and　modification　is　used　for　casting　the　A356　Al　alloy.　Self-generated　inclusion-eliminating　flux　exhibits　excellent　purification　in　the　alloy　with　an　inclusion-removal　rate　of　74　%.　The　grains　of　eutectic　silicon　are　fine　or　vermicular,　and　diffusely　distributed　in　the　A356　Al　alloy　at　a　0.012　w/%　Sr　addition.　The　mechanical　properties　of　the　alloy　are　significantly　improved,　including　a　tensile　strength　of　208.5　MPa　and　an　elongation　of　17.5　%.　As　the　Sr　addition　is　increased,　the　comprehensive　properties　of　the　material　are　not　improved.　The　Sr　addition　can　be　reduced　to　a　certain　degree　during　the　modification　of　the　melt　after　high　purification.　The　addition　of　0.012　w/%　Sr　is　most　preferable　in　the　alloy.