Abstract: With plastering gypsum as the matrix, phase change and humidity storage fibers were mixed with plastering gypsum to prepare phase change and humidity storage fibers/gypsum composite. Basic performance, humidity storage humidity controlling performance, phase change temperature controlling performance and durability performance of phase change and humidity storage fibers/gypsum composite were tested and analyzed. Structural composition and microstructure of phase change and humidity storage fibers/gypsum composite were analyzed by FTIR and SEM. The results show that phase change and humidity storage fibers with mass content of 40.0wt% can provide the best performance and good durability performance of phase change and humidity storage fibers/gypsum composite. The standard diffusion degree of water consumption is 0.70, initial setting time is 40 min, final setting time is 55 min, bulk density is 1 005.56 kg/m³, tensile connection strength is 0.10 MPa and compressive strength is 2.55 MPa. Equilibrium moisture content is 0.0395-0.0935 g·g^-1 in relative humidity 40%-65%. Cooling time is 100 s form 35℃ to 20℃ with clear phase change platform. After the cycling test, the moisture absorption performance decline of phase change and humidity storage fibers/gypsum composite is less than 10%, phase change and temperature controlling performance decline is less than 5%.