Strong　metal-support　interaction　(SMSI)　is　a　crucial　factor　that　determines　the　structure　and　performance　of　a　supported　metal　catalyst.　Herein,　the　SMSI　effect　of　Rh　nanoparticle　catalyst　supported　on　h-BN　is　investigated　in　the　dry　reforming　of　methane　(DRM)　reactions　with　different　CO2/CH4　ratios.　The　catalyst　characterization　results　demonstrate　that　the　SMSI　effect　allows　the　Rh　nanoparticles　to　be　encapsulated　by　BOx　overlayers　under　DRM　reaction　conditions　(CO2/CH4　=　1/1),　which　prevents　the　interaction　between　the　reactants　and　metal　centers　for　causing　rapid　deactivation.　By　increasing　the　partial　pressure　of　CO2　(CO2/CH4　=　3/1),　Rh/BN　exhibits　significantly　enhanced　activity　and　long-term　stability　in　the　DRM　reaction.　CO2　or　H2O　in　the　reactive　atmosphere　can　effectively　etch　the　BOx　overlayers　for　steadily　exposing　the　active　Rh-BN　interface　sites,　as　evidenced　by　the　characterization.　This　observation　extends　the　understanding　of　the　SMSI　effect　at　the　interfaces　between　metal　and　non-oxide　support.　©　2023　Elsevier　Inc.