等温模型广泛应用于斯特林制冷机的热力分析。该方法计算简便，能基本反映理论循环参数的变化关系，以此可探求降低各种损失的途径。但由于该模型的计算结果与实际情况偏离较远，因而需要修正。考虑到脉管制冷机的特殊性，采用改进的等温模型，着重分析了脉管制冷机的回热器阻力损失对制冷性能的影响，为等温模型在双向进气型脉管制冷机的应用及整机的优化设计奠定了基础。 Isothermal models are widely used in thermodynamic analysis of Stirling refrigerators. The method is easy to calculate and can basically reflect the changing relationship of theoretical cycle parameters, so as to find ways to reduce various losses. However, due to the calculation results of this model deviate from the actual situation, it needs to be amended. Taking into account the particularity of the pulse tube refrigerator, an improved isothermal model is adopted to analyze the influence of the resistance loss of the regenerator of the pulse tube refrigerator on the refrigeration performance. The application of the isothermal model to the two-way inlet pulse tube refrigerator The machine’s optimal design laid the foundation.