The　arcing　wire-VPPA　has　unique　advantages　in　arc　additive　manufacturing　due　to　its　reliable　control　of　mass　transfer　and　heat　transfer.　Aiming　at　single　channel　multi-layer　aluminum　alloy　additive　manufacturing,　a　single　side　wall　test　sample　was　designed　by　the　quadratic　general　rotation　unitized　design　method,　and　the　mathematical　model　between　process　parameters　and　molding　size　of　the　single　side　wall　was　established.　The　results　show　that　the　model　can　better　predict　the　cladding　size　of　the　single　side　wall　as　the　true　value　is　basically　the　same　as　the　fitted　one.　At　the　same　time,　it　is　found　that　the　influence　of　plasma　current,　welding　speed,　and　wire　feeding　speed　on　the　layer　height　is　obvious,　and　there　is　an　interaction　between　the　effect　of　plasma　current　and　that　of　welding　speed　on　the　layer　height.　However,　the　effects　of　plasma　current　and　variable　polarity　pulse　MIG　current　and　welding　speed　on　the　melting　width　are　more　obvious.　At　the　same　time,　the　control　strategy　of　the　widening　dimension　stability　of　the　additive　forming　was　analyzed.　It　is　found　that　the　control　scheme　of　the　plasma　current　in　the　arithmetic　progression　has　obvious　advantages　in　the　stability　control　of　the　additive　width.