In　order　to　reduce　the　center　offset　error　in　aspheric　surface　testing　by　annular　subaperture　stitching　interferometry,　the　mechanism　of　action　of　center　deviation　error　in　the　surface　shape　measurement　was　analyzed,　and　the　error　model　based　on　the　testing　principle　and　geometrical　relationship　was　established.　A　compensation　method　for　the　center　offset　error　based　on　two-dimensional　matrices　of　pixel　was　proposed.　The　method　is　effective　for　searching　the　center　offset　of　the　initial　surface　shape　measurement　data　and　reducing　the　eliminate　error　of　the　wavefront　error　caused　by　the　center　offset　error,　and　the　error　among　the　centers　of　annular　subapertures　can　also　be　decreased.　The　error　compensation　experiment　for　the　annular　subaperture　stitching　interferometry　was　carried　out　with　Zygo　interferometer.　The　errors　of　peak　to　valley　value　and　root　mean　square　are　-0.015λ　and　0.003λ　respectively　compared　with　the　null　aspheric　surface　testing　result.　The　experiment　results　show　that　the　proposed　method　greatly　reduces　the　surface　measurement　errors　and　improves　the　measurement　precision　of　annular　subaperture　stitching　interferometry.　©　2016,　Science　Press.　All　right　reserved.