Lead sulfide is one of the most promising materials for the creation of IR radiation detectors, sensors for toxic compounds, lasers, bio-sensors and solar energy converters based on it. Expanding the range of electrophysical and sensory properties of sulfide materials allows either the formation of solid solutions of Ag x Pb1-x S, or the alloying of PbS with silver ions. Among the existing physical and chemical methods for producing semiconductor layers of PbS, hydrochemical deposition has a significant prospect, which eliminates the need for heating to high temperatures and the use of complex expensive equipment to create a deep vacuum. Another important advantage of the chemical deposition of lead and silver sulfide films is the possibility of preliminary determination of the concentrations of the main components of the reaction mixture using the basic thermodynamic characteristics of the components of the reaction mixture. In particular, the analysis of ionic equilibria in the system «Pb(СН3СОО)2 - AgNO3 - Na3C6H5O7 - NH4OH - N2H4CS» it was found that under optimal conditions of hydrolytic decomposition of thiourea (pH = 12) complexes are predominant Pb(OH)C6H5O72-, Ag(N2H4CS)2+ и Ag(N2H4CS)2+. The concentration regions of the formation of lead and silver sulfides are graphically determined by varying the pH value, the concentration of ligands and the chalcogenizer. Kinetic studies of the processes of transformation of lead and silver salts into sulfides with varying process temperatures from 303 to 343 K revealed that the effective constants of the solid phase formation rate of PbS are 1.5 times less than Ag2S. Thin films of PbS and PbS doped with silver with good adhesion to the substrate were synthesized by hydrochemical deposition on a slide. The introduction of AgNO3 into the reaction mixture leads to an increase in the number of crystallites with a size of 0.2-1.0 μm from ~70 to 85% while maintaining a tetrahedral shape. Energy dispersion analysis revealed that both the PbS film and PbS(Ag) showed an excess of metal compared to chalcogen, in the second case with a content of 0.1% silver. The synthesized films have an n-type of conductivity, established by the sign of thermopower.