Dual-beam　CO2　laser　welding　process,　the　angle　of　the　dual-beam　laser　is　22°　,　was　used　to　research　the　pore　control　of　5083　aluminum　alloy　in　the　experiment.　The　experimental　data　show　that　the　welding　process　can　be　a　stable　one　in　deep　penetration　welding　and　the　surface　of　the　weld　is　in　the　state　of　smooth　and　good　forming　when　the　interval　between　the　focuses　of　the　dual-beam　is　0.4mm.　At　the　same　time　the　pore　tendency　is　greatly　reduced　in　the　inside　of　the　weld.　When　the　interval　between　the　focuses　of　the　dualbeam　is　in　the　case　of　0mm　or　more　than　0.6mm　the　welding　process　becomes　unstable　and　more　big　hores　are　found　in　the　weld.　Also,　the　results　indicate　that　the　changes　of　the　angle　and　arrangement　of　the　dual-beam　laser　make　quite　different　outcome　in　the　welding　of　5083　Aluminum　Alloy.