The　purification　of　commercial　aluminum　by　filtrating　with　high-efficient　flux　for　removing　inclusions　and　its　mechanism　were　studied.　It　is　found　that　combining　reasonable　flux　components　with　purification　technology　is　the　key　to　ensuring　its　effect　of　removing　moving　inclusions　high-efficiently　from　molten　aluminum.　With　special　flux　(CJ-5)　and　filtration　technology,　and　proper　addition　amount　(3%)　and　melting　temperature　(720°C),　the　rate　of　removing　inclusions　and　the　extent　of　lowering　porosity　for　different　grades　commercial　aluminum　could　amount　to　about　70%-82%　and　60%-88%　respectively,　and　the　mechanical　properties　of　this　material　were　improved　remarkably,　especially　the　relative　increase　of　elongation　(δ)　was　about　70%　in　comparison　to　that　of　no　filtration.　The　main　reason　of　removing　inclusions　high-efficiently　for　this　method　is　that　it　can　make　three　processes　-　melting,　flux　filtration　and　adsorbing　inclusions　with　activated　flux　be　fulfilled　simultaneously　in　the　whole　course　of　melting　of　aluminum,　which　accords　with　the　purification　principle　that　more　attention　should　be　firstly　paid　on　removing　inclusions,　thus　giving　full　play　to　the　purification　efficiency　of　the　flux.