By using low grade solar energy, the utilization of heat energy can be increased more than 50%.The solar energy is cleanliness without any pollution, and can be used unboundedly. For our present energy structure is not proper, we have to use low grade energy instead of high grade energy. Vuilleumier (VM) cycle system include two Isochoric and isothermal processes [1], it has many advantages, such as low requirement for seal, low noise and pollution levels, long life and so on. This paper analyzes the performance of solar driven VM heat pump, and calculates an example of the system, points the advantages of solar-driven.

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