Combustion　tests　of　pre-mixture　of　methane　and　air　in　constant　volume　combustion　chamber　(CVCC)　have　been　carried　out　by　means　of　flame　propagation　photo　and　gas　pressure　measurement,　the　effects　of　CVCC　body　temperature,　intake　pressure　of　pre-mixture　of　methane　and　air,　equivalence　ratio　and　location　of　the　built-in　adaptor　have　been　investigated.　The　whole　combustion　chamber　can　be　divided　into　two　parts,　i.e.　the　upper　combustion　chamber　and　the　lower　combustion　chamber,　by　the　built-in　adaptor　with　through　hole.　Owing　to　the　built-in　adaptor　with　through　hole,　jet　ignition　or　compression　ignition　(auto-ignition)　phenomena　may　occur　in　the　lower　combustion　chamber,　which　is　helpful　to　getting　higher　flame　propagation　velocity,　higher　combustion　peak　pressure,　low　cycle-to-cycle　variation　and　more　stable　combustion　process.