The　explosive　properties　of　methane-ethane　mixtures　with　different　concentrations　and　ethane　proportions　(φ　value)　were　studied　in　a　1　m3　spherical　vessel,　along　with　the　inhibitory　effects　of　N2　and　CO2.　The　results　indicate　that　when　the　concentration　of　the　total　gas　mixture　was　10%,　Pmax　and　(dp/dt)max　first　increased　and　then　decreased　with　the　increase　of　φ.　In　contrast,　for　total　gas　mixture　concentrations　of　8%　and　12%,　Pmax　and　(dp/dt)max　showed　a　single　change.　Under　the　test　conditions　of　this　experiment,　Pmax　reached　its　maximum　value　when　the　total　gas　mixture　concentration　was　10%　and　φ　=　0.1.　The　explosion　suppression　of　gas　mixtures　showed　that　both　N2　and　CO2　could　significantly　reduce　Pmax　and　(dp/dt)max　when　their　volume　fractions　increased　to　9%.　While　the　continued　addition　of　N2　and　CO2　did　not　significantly　reduce　Pmax　and　(dp/dt)max,　it　further　delayed　the　arrival　time　of　the　peak,　with　a　greater　magnitude　of　delay　for　CO2.　Regarding　the　flame　propagation　process,　the　same　volume　fraction　of　CO2　can　reduce　the　flame　propagation　speed　more　effectively,　and　the　bottom　of　the　flame　is　more　significantly　affected　by　buoyancy　instability.　©　2025　American　Institute　of　Chemical　Engineers.