The study of accessory minerals allows us to solve many questions of geology. Apatite can be used as a geochronometer (track method) and a geothermometer (apatite-biotite Ludington geothermometer, apatite Watson-Harrison geothermometer). Saturation thermometry of E. Watson and T. Harrison with the correction of F. Bea makes it possible to identify the temperature conditions of rock formation based on the data of the silicate method. The petrogenic elements contents analysis of the Kuzpuyu massif granite (the Subpolar Urals) established the temperature regime of the early magmatic stage of formation of the granites under consideration with an average temperature of 825°C.