The　partial　oxidation　of　methane　(POM)　is　a　promising　method　for　converting　methane　to　syngas.　The　transition　metal　supported　on　boron　nitride　(BN)　has　recently　been　studied　as　part　of　a　catalog　of　emerging　catalysts.　However,　the　chemical　state　of　the　metal　supported　on　BN　during　methane　reforming　is　still　in　debate.　In　this　work,　we　report　a　rhodium　catalyst　on　boron　nitride　(Rh/BN)　for　the　POM,　with　exceptional　activity　and　long-term　stability　at　600　degrees　C　for　230　h.　The　Rh/BN　catalyst　was　investigated　by　X-ray　diffraction,　X-ray　photoelectron　spectroscopy,　Raman　spectroscopy,　transmission　electron　microscopy,　and　diffuse　reflectance　infrared　Fourier　transformed　spectroscopy　(DRIFTS).　As　revealed　by　in　situ　DRIFTS,　the　infrared　band　(2020　cm(-1))　of　the　product　molecule,　CO,　adsorbed　on　the　Rh,　as　the　probe　confirms　the　metallic　state　of　Rh　during　the　POM　reaction.　In　addition,　the　results　of　in　situ　DRIFTS　indicate　that　the　reactive　gaseous　environment　would　react　with　the　catalyst　to　form　B-OH　and　B-H,　which　synergistically　boost　the　POM　activity.