In continuation of our previous studies for electrodeposition of mercury-cadmium selenide thin films, we have now focused on the improvement of the composition of film to obtain single-phase of chalcogenide. The bath temperature dependence of the composition of Hg1-xCdxSe thin films electrodeposited on titanium substrate from an aqueous solution containing Hg2+, Cd2+, H2SeO3 and supporting electrolyte has been investigated. The photoluminescence results demonstrated that by increasing the bath temperature and using supporting electrolyte a single phase of Hg1-xCdxSe is deposited. Crystallinity is enhanced by annealing treatment and a smooth surface is observed without cracking of the film.