切换式脉管制冷机用于天然带压气源获取冷量，具有一定的优势。本文着重在理论数值分析上对其性能进行了研究，建立了切换式脉管制冷机的数学模型，对制冷机内部过程进行了数值模拟计算，并用实验验证了数值分析的可靠性。计算结果揭示了主要结构参数和操作参数同性能指标的关系。理论数值分析为切换式脉管制冷机的进一步结构优化提供了具有重要参考价值的依据。 Switching pulse tube refrigerator for natural gas source for cold, with some advantages. This paper focuses on theoretical analysis of the numerical performance of the switch pulse-tube refrigerator mathematical model was established to simulate the internal process of the refrigerator numerical simulation and experimental verification of the reliability of numerical analysis. The calculation results reveal the relationship between the main structural parameters and operating parameters with the performance indicators. The theoretical numerical analysis provides the basis for the further structural optimization of the switched-pulse tube refrigerator with important reference value.