Svanbergite, SrAl₃PO₄SO₄(OH)₆ is a phosphate mineral resistant to acid, alkaine and fluoride solutions.Results of X-ray diffraction showed ehc mineral was transformed into amorphous substance after caleination at about 700℃.AlPO₄ and other substances were formed when ealcined at higher temperature.The results of pot experiment indicated that the phosphate absorbed by wheat form calcined amorphous svanbergite was markedly higher.The effect of calcined amorphous svanbergite on wheat yield was about 85% of superphosphat at the same rate.in calcareous soil.