To　study　the　factors　influencing　the　surface　quality　of　5052　aluminum　alloy　thin　sheet　workpiece　formed　by　numerical　control　incremental　forming,　the　cone　frustum　piece　with　forming　angle　of　60°　and　45°,　and　the　square　cone　piece　with　forming　angle　of　45°　were　prepared,　respectively.　The　surface　of　the　sample　was　observed　by　a　metallographic　microscope　firstly,　and　then　was　measured　quantitatively　by　using　three-dimensional　surface　profiler.　The　measurement　data　was　pretreated　based　on　wavelet　analysis,　and　the　roughness　components　of　the　sample　surface　were　extracted.　The　factors　affecting　surface　quality　were　analyzed　by　power　spectrum　and　three　dimensional　surface　characteristic　parameters.　It　is　found　that　due　to　the　impact　of　rolling　and　dragging　of　the　forming　tools,　the　abrasive　wear　and　scratches　on　the　surface　of　the　incremental　forming　parts　are　quite　serious.　The　forming　angle　is　an　important　factor　affecting　the　surface　quality　of　the　workpiece,　and　the　surface　roughness　increases　with　the　decrease　of　the　forming　angle.　The　geometrical　shape　has　no　significant　effect　on　the　surface　roughness　of　the　workpiece.　The　three　dimensional　characteristic　parameters　of　surface　and　power　spectrum　can　be　used　to　characterize　the　surface　quality　of　incremental　formed　workpiece.　©　2018,　Editorial　Board　of　Journal　of　Plasticity　Engineering.　All　right　reserved.