Abstract: The explosive method at elevated temperature is used for releasing inclusion water of mineral samples, and deuterium analyses of the water are performed using the metallic uranium method, while oxygen-18 analyses are made by reaction of the water with bromine pentafluoride. The precision and accuracy in the deuterium measurements are investigated. The mean deviation is±1.2‰. The result of this method is compatible with the data determined by the method of Mg powder reduction. Replicate analysis are made for the inclusion water in serveral samples and the D reported are precise to±2.5‰ and the deviation of 18O is±0.5‰.