KPrP4P12 crystals were grown by evaporation solution method. The conditions of growth were studied and some better crystals were obtained. Chemical analysis and X-ray diffraction pattern proved the grown crystals to be KPrP4O12.The crystal structure of KPrP4O12 can be divided into two types. Their infrared, absorption and fluorescence spectra have been determined. It may prove to be a novel laser crystal.