For the long-term storage of hemihydrate phosphogypsum (HPG), the gelling performance will decrease. Based on the indoor crystal water conversion and uniaxial compression test, by setting 4 different curing temperatures, respectively 20, 40, 60 and 80℃, to explore the HPG crystal water conversion and storage of the storage body under different curing temperatures The compressive strength development law of the filled cementitious material (HCM) prepared after curing, and microscopic analysis methods such as SEM are used to study the mechanism of curing temperature on its strength. The results show that the curing temperature has a significant effect on the HPG gelation performance of the stack, and a high curing temperature will accelerate the conversion of HPG crystal water and inhibit the strength development of the HCM prepared after stacking. Data standardization is used to predict the compressive strength of samples at various curing temperatures, which is confirmed to be in good agreement with the measured values. Microscopic analysis found that the curing temperature mainly affects the supersaturation of the system, and the microscopic morphology of HCM under the action of different curing temperatures is different.