In　order　to　improve　the　methane-air　mixture　combustion　rate,　the　experiment　of　a　divided　constant　volume　combustion　bomb　is　carried　out　for　fast　burning　of　methane-air　mixture　by　jet　ignition.　The　effects　of　baffle　plate　parameters,　such　as　location,　orifice　diameter　and　orifice　number,　on　fast　burning　of　methane-air　mixture　by　jet　ignition　under　various　initial　conditions　are　studied　by　means　of　schlieren　method.　The　experimental　data　of　constant　volume　combustion　bombs　with　and　without　single　and　plural　orificed　baffle　plates　are　compared.　The　results　show　that　the　combustion　rate　is　improved　by　an　orificed　baffle　plate.　The　location　C　in　the　constant　volume　combustion　bomb　is　the　best　place　since　the　main　combustion　chamber　is　easy　to　burn　under　certain　experimental　conditions.　The　peak　combustion　pressure　of　the　methane-air　mixture　increases　first　and　then　decreases　with　the　increase　in　the　diameter　and　number　of　orifices.　©,　2014,　China　Ordnance　Society.　All　right　reserved.