Chemical deposition from aqueous solutions of films of substitutional Cd_ x Pb_1 - _ x S solid solutions with a cubic B 1 structure on substrates made of monocrystalline silicon, sitall, conductive ITO coating, and a glass slide is carried out. A comparative analysis of films deposited on substrates made of various materials reveals a number of peculiarities associated with their morphology, granulometric, elemental and phase composition. To improve the quantitative assessment of the structural parameters of Cd_ x Pb_1 - _ x S films obtained on various substrates, the profiles of diffraction reflections are proposed to be described by three- or two-phase models, taking into account the background of diffuse scattering from an amorphous material or excluding reflections from the crystalline material of the substrate. X-ray diffraction, XPS spectroscopy, and optical studies have shown that the synthesized films contain, in addition to the Cd_ x Pb_1 - _ x S phase, impurity wide-gap compounds of Pb(OH)_2, PbCO_3 ∙ x Pb(OH)_2, and CdS.