The　application　of　heat　transfer　technology　to　control　the　delay　time　of　using　second　level　delay　composition　is　researched　in　this　work.　Experiments　were　carried　out　to　investigate　the　factors　of　affecting　delay　time　of　the　metal　clapboard　equipment　in　which　the　tungsten　type　delay　composition　was　used　as　the　energy　input　one.　Numerical　simulation　was　implemented　using　ANSYS　software　and　its　results　were　compared　with　the　experimental　ones.　The　research　findings　show　that,　during　the　heat　transfer,　the　second　ignition　composition　is　ignited　at　the　center　of　the　clapboard　output　terminal.　The　5　s　ignition　temperature　of　the　second　ignition　composition　is　189.33°C,　which　is　relatively　low　and　is　easy　to　be　ignited.　Also,　it　is　found　that　the　bigger　the　charge　density　is,　the　more　accurate　the　delay　time　is.　When　the　charge　density　changes　from　3.2　g/cm3　to　4.0　g/cm3,　the　relative　error　of　delay　time　is　decreased　from　11.2%　to1.6%.　Moreover,　by　Origin　numerical　fitting　method,　the　relation　of　delay　time　with　the　thickness　of　metal　clapboard　is　a　quadratic　function.