Abstract: 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 ℃,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.