A　novel　process,　named　twin-body　plasma　arc　welding　(PAW),　is　proposed　in　this　study.　In　this　novel　process,　the　wire　is　used　as　introduced　electrode　to　adjusting　the　energy　distribution　between　base　metal　and　droplet,　and　a　strong　plasma　flow　force　is　applied　to　the　droplets.　To　understand　the　characteristics　of　droplet　transfer　behaviour　in　this　process,　this　paper　analyses　the　changes　in　the　forces　acting　on　the　droplet　and　carry　on　experiments　to　study　the　effect　of　the　current　separation　ratio　and　plasma　gas　flow　rate　on　droplet　transfer　behaviour.　The　results　show　that　as　the　current　separation　ratio　increases,　the　total　energy　acting　on　the　droplet　and　the　promoting　force　of　droplet　transition　are　enhanced,　and　the　droplet　transfer　behaviour　and　wire　melting　speed　are　changed　significantly.　As　the　plasma　gas　flow　rate　increases,　the　plasma　flow　force　is　enhanced,　and　the　droplet　transfer　behaviour　is　changed,　but　the　droplet　transfer　position　is　almost　unchanged.　Through　reasonable　parameter　matching,　the　spray　transfer　could　be　realized　under　low　current,　and　the　droplet　transfer　mode　could　be　freely　changed　from　globular　to　spray　when　the　total　current　remains　unchanged.