Abstract: H-PA-LA/SiO₂ ternary phase change system composites were prepared with hexadecanol (H)-palmitic acid (PA)-lauric acid (LA) as a phase change material, SiO₂ as the carrie material by sol-gel method by different amounts of H-PA-LA. The moisture performance and heat performance of H-PA-LA/SiO₂ ternary phase change system composites were tested by isothermal sorption moisture method and cooling curve method, meanwhile composition structure, crystal structure, microstructure, size distribution, phase transition temperature and phase transition enthalpy of H-PA-LA/SiO₂ ternary phase change system composites were characterized by FTIR, XRD, SEM, LPSA and DSC. The results show that while H-PA-LA content is 0.06 mol, prepared H-PA-LA/SiO₂ ternary phase change system composites have the best heat-moisture comprehensive performance in the range of human comfort, such as equilibrium moisture content is 0.07-0.10 g/g, phase change temperature is 26.29℃, phase change enthalpy is 70.55 J/g in relative humidity 40%-65%.