The　multi-imaging　characteristics　of　CO2　laser-tungsten　inert　gas　(TIG)　arc　hybrid　welding　plasma　are　observed　by　a　high-speed　camera　with　a　self-made　multi-imaging　system.　The　research　results　show　that　three　regions　of　the　same　plasma　with　decreasing　area　and　increasing　light　intensity　can　be　obtained　at　the　same　time　by　multiple　imaging　technology.　The　color　of　plasma　gradually　changes　from　blue　and　white　to　red　in　argon　shielded　hybrid　welding,　and　the　metal　vapor　plasma　and　argon　arc　plasma　can＇t　be　distinguished.　Since　the　second　imaging,　helium　arc　plasma　is　almost　invisible,　and　the　remaining　metal　plasma　is　still　bright　white.　The　less　linear　spectrum　of　helium　radiation　in　the　visible　region　(relatively　weak　light　intensity)　is　the　main　reason　why　metal　plasma　can　be　distinguished　clearly　in　helium　protection;　the　metal　plasma　and　shielding　gas　plasma　are　not　fully　mixed　in　hybrid　welding.　And　the　morphology　of　the　metal　plasma　can　be　obvious　influenced　by　the　arc　plasma.　©　2019,　Chinese　Lasers　Press.　All　right　reserved.