The　pulsed　DC　tungsten　inert　gas　(TIG)　method　was　employed　to　post-spray　treat　an　electroconductive　Al2O3-TiB2　coating　by　atmosphere　plasma　spraying　(APS)　Al2O3-30　wt-%TiB2　powder.　The　microstructure　and　mechanical　properties　of　the　coatings　before　and　after　treatment　were　comparatively　investigated　by　scanning　electron　microscopy,　laser　scanning　confocal　microscopy,　X-ray　diffraction,　microhardness　tester　and　block　on　ring　wear　tester.　It　was　detected　that　the　treated　coating　presented　a　two　layer　structure　consisting　of　the　remelted　zone　and　the　sintered　zone,　which　was　comprised　of　TiB2　and　single　alpha-Al2O3;　surface　roughness　of　the　treated　coating　exhibited　a　remarkable　decrease　while　microhardness　and　wear　resistance　showed　a　significant　increase.　These　experimental　results　could　be　ascribed　to　the　effect　of　high　heat　input　and　discharge　plasma　during　the　pulsed　DC　TIG　treating.