The　objective　of　this　paper　is　to　determine　the　erosion　characteristics　of　bipolar　axial　magnetic　field　contact　exposed　to　high-current　vacuum　arcs.　A　pair　of　horseshoe-type　contacts　with　contact　diameter　of　120　mm　and　contact　material　of　CuCr30　(30%　Cr),　were　arranged　in　a　demountable　vacuum　chamber.　Drawn　arc　experiments　were　carried　out　in　an　L-C　discharging　circuit.　Arc　current　ranged　from　4　kA　to　40　kA.　Vacuum　arc　behaviors　were　recorded　by　a　high-speed　camera.　After　experiments,　vacuum　arc　behaviors　and　macroscopic　erosion　characteristics　were　analyzed,　and　the　whole　contact　surface　was　divided　into　three　parts　-　two　serious　erosion　regions　and　a　slight　erosion　region.　Then　microstructures　of　contact　surface　and　cross　section　in　each　region　were　observed　by　a　scanning　electron　microscope　(SEM).　For　the　results,　the　molten　craters　in　the　slight　erosion　region　of　the　contact　are　smaller　in　size　and　fewer　in　number　than　in　the　serious　erosion　regions.　And　the　molten　layer　distribution　on　the　contact　surface　was　asymmetrical　due　to　the　imbalance　of　arc　columns.　©　2018　IEEE.