In order to study the effect of different pretreatment processes on the properties of phosphogypsum,the chemical composition,micro morphology and crystal form of phosphogypsum were characterized by X-ray diffraction,X-ray fluorescence,scanning electron microscope and thermogravimetric analysis.The index of mechanical properties,working properties,setting time and water demand of undisturbed phosphogypsum were compared by calcination method,microwave calcination method,water washing method and ball milling method.The results showed that the calcination method and water washing method had obvious removal effect on soluble P₂O₅,fluorine and organic matter.The time of microwave calcination was short,only about 20 min.The ball milling method could refine particles,and the best treatment time was about 20 min.The physical and chemical properties of phosphogypsum prepared by pretreatment had been greatly improved,and the compressive strength and flexural strength were better than the 《calcined gypsum》（GB/T 9776—2008）standard,which had a great application prospect.