A　series　of　experiments　are　conducted　to　investigate　the　effect　of　vent　burst　pressure　on　stoichiometric　hydrogen-air　premixed　flame　propagation　and　pressure　history　in　a　1　m(3)　rectangular　vessel　in　this　paper.　Pressure　buildup　and　flame　evolution　are　recorded　using　piezoelectric　pressure　transducers　and　a　high-speed　camera,　respectively.　The　results　show　typical　pressure　peaks　of　three　different　mechanisms　for　all　vent　burst　pressures　in　the　experiments.　The　first　pressure　peak,　generated　by　the　rupture　of　the　vent　cover,　increases　with　the　vent　failure　pressure,　with　the　subsequent　outflow　inertia　of　combustion　products　giving　rise　to　a　negative　pressure.　The　second　pressure　peak　results　from　the　constant　bulk　motion　of　the　flame　bubble　(the　Helmholtz　oscillation),　and　the　third　is　produced　by　the　interaction　between　the　combustion　waves　and　the　acoustic　waves.　The　time　interval　between　the　first　pressure　peak　and　the　second　pressure　transient　remained　nearly　constant.　The　Helmholtz　oscillation　always　appears　as　the　vent　ruptures　and　its　magnitude　increases　with　the　vent　burst　pressure.　Furthermore,　the　lower　the　vent　failure　pressure,　the　longer　the　Helmholtz　oscillation　is　sustained.　The　peak　of　the　acoustically　enhanced　pressure　always　occurs　within　several　milliseconds　of　the　flame　front　touching　the　vessel.　From　a　theoretical　perspective,　Rasbash＇s　equation　models　the　relationship　between　the　maximum　reduced　explosion　overpressure　and　the　vent　burst　pressure　precisely.　Also,　it　is　observed　that　the　maximum　lengths　of　the　external　flames　were　found　to　be　nearly　identical　in　all　tests,　but　the　average　propagation　rate　of　the　flame　front　increases　with　the　vent　burst　pressure.　It　is　interesting　that　a　phenomenon　of　intense　oscillation　of　internal　flame　bubble　was　observed　with　the　increase　of　vent　burst　pressure.　(C)　2018　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.