As　a　new　composite　welding　heat　source　introduced　in　recent　years,　the　cross-coupling　arc　uses　a　non-consumable　electrode　arc　(plasma　arc)　and　a　consumable　electrode　arc　(inter-wire　arc)　in　cross-coupling,　in　which　the　plasma　arc　is　the　main　arc　and　the　inter-wire　arc　is　the　vice　arc,　to　realize　the　separate　control　of　the　heat　input　to　the　workpiece,　arc　force,　and　droplet　transfer.　To　reveal　the　electrical　characteristics　of　the　inter-wire　arc　under　the　action　of　the　plasma　arc,　in　this　study,　rotating　probes　are　used　to　sweep　across　the　plasma　arc.　When　the　probes　rotate　into　the　plasma　arc,　a　circuit　is　formed,　and　the　electrical　characteristics　of　the　inter-wire　arc　are　indirectly　analyzed　according　to　the　circuit:　the　probe　centering　current　and　input　voltage　are　used　as　the　physical　quantities.　The　results　show　that　at　a　certain　wire　feed　rate,　the　inter-wire　arc　current　increases　with　increasing　input　voltage.　When　the　input　voltage　is　low,　the　wire　feed　rate　has　no　obvious　effect　on　the　inter-wire　arc　current.　At　a　higher　input　voltage,　where　the　wire　feed　rate　is　high,　the　inter-wire　arc　current　decreases.　With　the　increase　in　the　plasma　arc　current,　the　inter-wire　arc　current　first　increases　quickly　and　then　increases　slowly,　and　simultaneously,　the　striking　arc　time　becomes　longer.　With　the　increase　in　the　interval　between　the　nozzle　and　the　workpiece,　the　inter-wire　arc　current　increases,　but　when　the　arc　length　increases　to　a　certain　limit,　the　slope　of　the　welding　current　clearly　declines.