In order to increase generation power of fuze TPV power supply system, the process of heat transferring inside the false cap was analyzed based on temperature field of steady-state. According to results of analysis, a two-section false cap consisting of two kinds of materials with different thermal conductivity bonded by high-temperature adhesive agglutinant was put forward. Computation results indicate that compared with false cap made up of a single material, the two-section false cap has higher temperature in its head and temperature distribution is more uniform, which resultes in great increase of radiation power. What's more, the tail temperature is lower, which is good for heat dissipation. The above mentioned results suggest that two-section false cap can increase power generation of fuze TPV power supply system theoretically.