Abstract: This paper proposes a phase change heat storage technology solution, for the temperature control requirement of the high power equipment in the cabin of the vehicle. And a physical model of the finned reinforced phase change heat storage device is established. A high efficiency finned phase change heat storage device is designed, according to the parameters such as the heat source power and the operating mode of the high power servo actuator controller. And the ground test is carried out, to verify the temperature control performance of the phase change heat storage device, the stability, and the internal temperature difference. The test results indicate that the device can be controlled below 50℃ for more than 3000 s under the heat source power of 120 W. A good sealing performance is achieved with the use of the tongue and the groove in the form of a package structure, and the same performance can retain under a number of phase change cycles. The phase change heat storage device is in an isothermal state, and the internal maximum temperature difference is 3℃ after the heat source is maintained for 3 000 s.