The chemical bath deposition kinetics of indium(III) sulfide by means of thioacetamide in tartaric and hydroxylamine solutions at 333-363 K in spontanious nucliation conditions of solid phase was studied. The formal-kinetic equation of indium(III) sulfide formation rate was determined. The formal-kinetic equation of indium(III) sulfide formation rate with determination of individual orders on all component in system and an activation process energy was made.