The　metal　transfer　behaviour　of　slant　feature　of　thin-walls　fabricated　by　cold　metal　transfer　(CMT)　process　in　step-over　deposition　mode　was　observed　by　high　speed　camera.　A　slanted　short　circuiting　transfer　(SSCT)　was　generated　during　deposition　and　then　analysed　by　asymmetrical　magnetic　and　force　model,　complicating　metal　transfer　behaviour　in　comparison　with　conventional　deposition　process.　The　SSCT　allowed　the　droplet　to　transfer　obliquely　into　the　molten　pool　on　previous　layer,　owing　to　the　pushing　force　generated　by　unevenly　distributed　electromagnetic　field　in　asymmetrical　deposition　model.　The　surface　tension　between　wire　and　liquid　metal　is　the　most　important　force　that　retarded　droplet　transfer.　The　retraction　force　and　electromagnetic　force　are　the　main　forces　to　promote　droplet　transition.　The　positive　forces　that　promote　droplet　transfer　process　can　be　arranged　as　Fem　＞　Fr　＞　Fg.　The　wall　width　was　mainly　affected　by　wire　feed　speed　and　the　inclined　angle　can　be　significantly　increased　with　increasing　step-over　distance.