Abstract: Missile-borne and satellite-borne electronic facilities have the characteristics of short-time, high power and high heat flux. One of the most important solutions is using composite phase change device which uses metal foam as its frame and is filled with paraffin PCM. During the numerical simulation for the device with complicated structure and this enhanced heat transfer, the determination of the heat conductivity coefficient of composite PCM is one of the difficulties which influence the simulation accuracy. The engineering application of the heat transfer parameters testing method for this type of device is mainly studied in this paper. Several commonly used composite phase change combinations are selected to perform testing and verification. The study result is applied to the temperature simulation of a phased array antenna, showing that it has good practicability and can be easily applied to relevant fields.