The　new　refiner-AlTiBRE　master　alloy　was　prepared　by　using　the　technique　of　fluorid　salts,　and　its　element　proportion　was　optimized　by　means　of　orthogonal　experiment.　At　the　same　time,　the　analyses　of　microstructure　and　component　of　refining　phases　in　the　master　alloy　were　studied　with　help　of　OM,　SEM,　EDAX　and　XRD.　The　results　indicated　that　the　proportion　of　the　elements　in　AlTiBRE　master　alloy　had　significant　effect　on　the　distribution　of　refining　particles　and　Ti　had　the　most　obvious　effect.　The　distribution　form　of　refining　phase　particles　was　improved　further　when　elements　component　in　the　master　alloy　is　5%Ti,　1%B　and　0.5%　RE.　The　TiAl　3　phase　was　fine　and　distributed　homogeneously　in　the　molten　aluminum,　thus　improving　refinement　effect　of　the　refiner　further.　In　addition,　the　function　of　RE　in　the　preparation　of　the　refiner　was　studied.　Results　showed　that　RE　mainly　impeded　the　accumulation　of　TiB　2　and　TiAl　3　in　molten　aluminum　and　refined　the　grains　of　TiB　2　and　TiAl　3.　At　the　same　time,　RE　can　purify　the　master　alloy　to　some　extent　during　the　process　of　melting,　thus　ensuring　the　metallurgical　quality　of　molten　master　alloy.