单级和两级相变复合材料体系隔热降温特性的优劣取决于相变复合材料体系的输出功率大小，输出功率越大，说明其有效性大即隔热降温特性越好．在单级相变材料中存在着最佳相变温度，因而产生最大有效输出功率．通过实验及理论分析证明：采用两级相变体系的效率要比单级相变体系的效率提高５９％． The advantages and disadvantages of the adiabatic cooling characteristics of the single-stage and two-stage phase change composite systems depend on the output power of the phase change composite system. The greater the output power, the more effective the heat insulation and cooling characteristics. In single-phase phase change materials, there is an optimum phase transition temperature, resulting in the maximum effective output power. Experiments and theoretical analysis show that the efficiency of using two-stage phase change system is 59% higher than that of single-stage phase change system.