Mechanical design is of great significance to the structural optimization of heat pump products. The key components of the heat pump cooperate to realize heating or cooling based on the reverse Carnot cycle. Its structural optimization involves material mechanical properties, tolerance fit, dynamic load analysis, etc. Through the integration of topology and parametric design, heat transfer interface optimization and other methods, the structural strength, heat transfer efficiency, reliability and other factors are comprehensively considered, and the optimization is realized through experiments and monitoring, which provides support for the industrial application of heat pump.