Surface　charge　accumulation　on　insulators　is　an　important　factor　to　incur　surface　flashover.　The　present　study　investigates　the　effects　of　surface　nonlinear　conductive　coatings　on　surface　charge　behavior　of　alumina-filled　epoxy　resin　spacers.　Five　SiC/epoxy　coatings　with　different　SiC　content　were　prepared　and　coated　on　spacer　surface.　The　surface　charge　distribution　in　atmospheric　pressure　air　under　DC　voltage　was　measured.　The　results　show　that　with　the　increase　of　SiC　content,　surface　charges　increase　firstly　then　decrease　on　SiC/epoxy　coated　surface　compared　with　uncoated　spacer.　With　the　increase　of　SiC　contents,　surface　charge　accumulation　can　be　divided　into　three　regions:　the　aggravation　region　at　low　SiC　content,　the　balance　region　at　moderate　SiC　content　and　the　suppression　region　at　high　SiC　content.　The　game　process　between　the　increased　trap　density　and　the　increased　non-linear　conductivity　caused　by　the　surface　coatings　is　considered　to　be　the　main　reason　for　the　formation　of　these　three　regions.　©　2019　IEEE.