In　this　study,　various　morphological　features　of　plasma　were　studied　by　using　the　visual　observation　during　fiber　laser-TIG　arc　hybrid　welding.　The　results　show　that　based　on　the　non-uniform　distribution　of　light　intensity　of　plasma,　approximately　3-4　images　of　plasma　can　be　obtained　simultaneously　by　using　the　multi-imaging　method　and　the　metal　and　arc　plasma　can　be　distinguished.　Compared　with　the　Ar　shielding　gas,　the　metal　and　arc　plasma　can　be　distinguished　more　easily　under　the　He　atmosphere.　Under　the　same　arc　current　and　imaging　conditions,　the　area　of　the　hybrid　welding　plasma　is　obviously　larger　than　that　of　the　single　arc　plasma,　and　the　area　of　the　plasma　in　hybrid　welding　with　an　TIG　arc-laser　mode　is　obviously　larger　than　that　of　the　plasma　in　hybrid　welding　with　a　laser-TIG　arc　mode.　Further　analysis　shows　that　the　metal　vapor　and　shielding　gas　are　not　fully　mixed　during　the　hybrid　welding.　In　addition,　metal　plasma　significantly　affect　the　morphology　and　stability　of　the　hybrid-welding　plasma.　©　2019,　Chinese　Lasers　Press.　All　right　reserved.