In order to validate the isotopic model of the general circulation of the atmosphere ECHAM5-wiso, a comparison of the model and experimental data on the isotope composition (δHDO and δH<inf>2</inf>¹⁸O) of precipitation and water vapor in atmospheric air at the surface for three Arctic observation stations was made. Experimental data on the isotope composition of water vapor were obtained at climate monitoring stations created and maintained by the Climate and Environment Physics Laboratory INS UrFU in Labytnangi and in Igarka, as well as the station located on Samoylov island, supported by the Melnikov Permafrost Institute of SB RAS and the Helmholz centre for polar and marine research, the Alfred Wegener Institute (Germany)