The developments of solar-selective absorption systems for the practical use of solar energy applications have been investigated. For the higher temperature use, 700 % 800°K, ZrCx/Zr films' with excellent heat-resistant characteristics were deposited on the stainless steel(SUS-304) pipes, 30 mm in diameter and 4500 mm in length, by reactive r-f sputtering of pure Zr cylindrical targets. The obtained collector surfaces exhibit the optical properties of a rÃ¢â‚¬Ëœ, 0.93 (in visible wave length region) and E ti 0.25 (at A = 3 % 4 μm) and heat-resistant durability at ti 900°K. An absorption tube is to be settled in an evacuated glass tube-type collector, coated with ITO selective transparent film, constructed in an Al parabolic plane mirror system for the solar - thermal electric power generator in the "Sunshine project". For the lower temperature use of the solar thermal energy, below 400 ~450°K, the Cr-CrOx composite films deposited on a thin Alfoil of 40 pm thick have been developed. Cr-CrOx composite films were deposited having a graded composition by reactively evaporating Cr metals in an oxygen atmosphere of oxygen partial pressure%of 10-2 % 10-3 Pa with a roll-coating system. The obtained optical characteristics are a % 0.9 in visible wave length region and c (ε,' 0.1 at λ = 6 ~ 10 μm. The products showing stable operating characteristics are capable to apply on the heating and cooling of buildings and other general uses.