The work is devoted to the study of the influence of various factors – temperature, concentration of components in the electrolyte and current density on the composition of electrodeposited thin semiconductor Mo–S films. Obtained results show that with increasing Na₂MoO₄ concentration, temperature and current density, the amount of molybdenum in cathode deposits increases. The concentration of Na₂SO₃ influences the amount of molybdenum in the obtained films, respectively. It is established that black, uniform, crystalline, shiny coatings of the  alloy Mo–S₂ are obtained in 333–338 K temperature range, 7 mA/cm² current density from electrolyte with the composition of 1.0 М Na₂МоO₄·2H₂O and 0.1 М Na₂SO₃