α-hemihydrate gypsum was prepared from phosphogypsum as raw materials in magnesium nitrate solution by the atmospheric salt solution method.With attapulgite and polyurethane used as the carrier,sodium sulfate decahydrate and crystalline sodium acetate binary eutectic hydrated salt used as the phase change materials,the form-stable phase change materials were prepared by the vacuum adsorption method.Then the α-hemihydrate gypsum and the form-stable phase change materials were combined to prepare the phosphogypsum-based phase change materials,and their mechanical strength and heat storage-release properties were investigated.The results showed that the bending strength and compressive strength of α-hemihydrate gypsum prepared from phosphogypsum were 8.9 MPa and 36.8 MPa,respectively.The phase change temperature of the shaped phase change material was 28.5 ℃,and the phase change enthalpy was 82.6 J/g.The compressive strength of the phosphogypsum-based phase change material was decreased due to the reduction of the gypsum crystal bonding points caused by the incorporation of the phase change material,but it still could meet the requirement of the use of building gypsum.The results of the heating and cooling experiments showed that the phosphogypsum composite phase change material had a certain energy storage effect compared with the pure phosphogypsum incubator with the temperature difference of 8.9 ℃.