A　new　device　and　a　corresponding　testing　system　are　designed　to　simulate　the　status　of　combustion　and　mechanics　of　propellant　charge　in　chamber.　The　gunpowder　gas　pressure　in　different　radial　positions　is　obtained　by　using　the　＇detecting　stick＇.　The　different　radial　pressure　testing　problem　in　the　same　chamber　section　is　solved.　The　flame　spreading　process　in　chamber　is　obtained　by　using　the　ray　fibre.　The　mechanics　status　near　the　projectile　base　before　the　propellant　being　ignited　is　obtained　by　using　a　projectile　base　sensor.　Simulation　experiments　are　accomplished　and　the　status　of　combustion　and　mechanics　of　charge　bed　in　chamber　is　obtained.　This　new　device　provides　a　new　method　for　the　study　on　the　simulation　of　the　status　of　combustion　and　mechanics　of　propellant　charge　in　chamber　and　the　launch　safety　of　propellant　charge.