Formation of the stable superconducting (SC) phase of intermetallide Nb3GexAl1 – x (x ≅ 0.2–0.30) by thermal annealing of multilayer structures of Nb/Ge/Al-like specimens under T = 1213 ± 20K in vacuum has been studied. The multilayer structures have been obtained by the method of electrochemical concretion of Ge and Al layers on Nb (Nb is a structural foundation). The critical (Ic) currents that flow inside the specimens at the temperature of He in magnetic fields H >> HC2(Nb) have been measured; the critical densities of the current (jc) have been rated. The nature of the (jc) dependence on the time of annealing, the magnetizing force H(Tl), the layer thickness of Ge -hGe (mcm) (at hAl ≈ const), and the layer thickness of Al-hAl(mcm) (at hGe ≈ const) have been determined. A conclusion on the technological expediency of the electrochemical method of obtaining multilayer Nb/Ge/Al-like structures for the purpose of SC intermetallides formation by means of the thermal-diffusion method has been reached.