The influence of temperature on structure Gd₂Fe₁₇ films are carried out. A films were prepared with the help of a thermal evaporation at different temperatures of NaCl-substrate carriers and then were exposed by thermal action in a column of the microscope. The temperature of substrate carriers changed within 300-400K range, and limits of thermal effect on  films make 300-800K. Structural studies were carried out with using of the electron microscope.
                Electron diffraction investigation of the films precipitated at Т_s=300K have shown, that these condensates are amorphous. It is noted, that at heating of such films the initial  phase at crystallization are  a-Fe crystallites sizes increase at with temperature. It is confirmed by of a half-width of the diffraction peaks in electron diffraction patterns reduce and it is also indicated in estimation of the sizes of crystallites electron-microscopic images. At further increase of temperature (up 100K higher then temperature of an initial a-Fe crystallization) the crystallization of Gd enriched amorphous matrix starts and as result  Gd₆Fe₂₃ crystallites are formed (structural type Gd₆Fe₂₃, space group Fm-3m). Crystallization of amorphous Gd2Fe17 films completed by forming of  polycrystalline film  a-Fe and Gd₆Fe₂₃.
                Significative the different pattern is observed in phase formation kinetic in mode of deposition of films of Gd₂Fe₁₇ alloy, obtained at heated substratecarriers. In Т_s=400 К range t are observed amorphous films. At Т_s=500K there films become as amorphous-crystalline. At the further increase of temperature of substrate carrier the fraction of a polycrystal phase increases. The interpretation of electron diffraction patterns has shown, that the polycrystalline films will consists three phases: Gd₂Fe₁₇ (60 %) structural type Th₂Ni₁₇, Gd₂Fe₁₇ (30 %) structural type Th₂Zn₁₇ and in a little (about. 10 %)  GdFe₅ structural type CaCu₅.