In order to study the internal temperature changes and heat transfer phenomena of a model during external warming, a heat transfer simulation was conducted. The thermal analysis of the model was simulated by using ANSYS/LS-DYNA software, and the heat and heat transfer phenomena of the warhead in the actual process were simulated by setting the temperature conditions on the surface of the model, and the model boundary and internal temperature changes were obtained from the simulation experiments, and relevant conclusions were drawn.