Based　on　the　current　situation　of　high　precision　and　comparatively　low　APA　(absolute　positioning　accuracy)　in　industrial　robots,　a　calibration　method　to　enhance　the　APA　of　industrial　robots　is　proposed.　In　view　of　the　＂hidden＂　characteristics　of　the　RBCS　(robot　base　coordinate　system)　and　the　FCS　(flange　coordinate　system)　in　the　measurement　process,　a　comparatively　general　measurement　and　calibration　method　of　the　RBCS　and　the　FCS　is　proposed,　and　the　source　of　the　robot　terminal　position　error　is　classified　into　three　aspects:　positioning　error　of　industrial　RBCS,　kinematics　parameter　error　of　manipulator,　and　positioning　error　of　industrial　robot　end　FCS.　The　robot　position　error　model　is　established,　and　the　relation　equation　of　the　robot　end　position　error　and　the　industrial　robot　model　parameter　error　is　deduced.　By　solving　the　equation,　the　parameter　error　identification　and　the　supplementary　results　are　obtained,　and　the　method　of　compensating　the　error　by　using　the　robot　joint　angle　is　realized.　The　Leica　laser　tracker　is　used　to　verify　the　calibration　method　on　ABB　IRB120　industrial　robot.　The　experimental　results　show　that　the　calibration　method　can　effectively　enhance　the　APA　of　the　robot.