Abstract: With plastering gypsum as basis material,decanoic acid-palmitic acid-SiO₂ phase change and humidity storage composites were mixed with plastering gypsum to prepare decanoic acid-palmitic acid-SiO₂/gypsum phase change and humidity storage composites.Basic performance,humidity storage humidity controlling performance,phase change temperature controlling performance and durability performance of decanoic acid-palmitic acid-SiO₂/gypsum phase change and humidity storage composites were tested and analyzed.Structural composition and microstructure of gypsum phase change and humidity storage composites were analyzed by FTIR and SEM.The results show that decanoic acid-palmitic acid-SiO₂ phase change and humidity storage composites with mass content of 40wt% can provide the best performance and good durability performance of decanoic acid-palmitic acid-SiO₂/gypsum phase change and humidity storage composites.The standard diffusion degree of water consumption is 0.69,initial setting time is 37 min,final setting time is 51 min,bulk density is 916.67 kg·m^-3,tensile connection strength is 0.08 MPa and compressive strength is 1.76 MPa.Equilibrium moisture content is 0.0620-0.0849 g·g^-1 in relative humidity 40%-65%.Cooling time from 30℃ to 15℃ is 610 s with clear phase change platform.After the cycling test,the moisture absorption performance decline is 6.44%-9.45%,phase change and temperature controlling performance decline is 7.2%.