As　for　precise　components　of　aluminum　alloy　by　brazing,　the　tradition　techniques,　such　as　electronic　beam　welding　and　TIG/MIG,　are　not　suitable　for　repairing　the　defects　which　were　found　in　the　brazing　seam　during　the　brazing　process.　Laser　may　be　the　best　one　of　all　heat　sources　because　of　its　advantages,　like　high　energy　density,　low　heat　input,　well　flexibility　and　controlling.　In　this　paper,　the　influence　to　the　stability　of　laser　welding　process　caused　by　the　brazing　flux　was　studied.　By　adopting　optimized　parameters,　the　butt　joint　samples　of　6063　aluminum　alloy　plate　with　the　thickness　of　3.0mm　made　by　vacuum　brazing　process,　which　had　had　the　groove　with　different　depth　on　the　original　brazed　joint　by　milling,　were　used　in　the　experiments　by　laser　welding　with　filler　wire.　The　results　showed　that　some　elements　of　flux　remained　in　brazing　seam　were　the　main　factor　to　influence　the　stability　of　laser　welding　process.　For　the　brazing　seam　with　the　groove　depth　of　2.0mm,　laser　welding　with　filler　wire　could　restrain　the　harmful　impact　of　elements　in　the　welding　process.　The　weld　with　the　surface　of　clean,　smooth　and　without　pore　was　gained　by　laser　welding　with　filler　wire,　as　same　as　the　result　when　brazing　seam　was　completely　removed.