Selective spectral transmittance and heat conservation efficiencies of some heat-mirror systems consisting of ZnS/Me (Me=Al or Ag) under different configuration were studied. The 15 nm ZnS/20 nm Ag system has optimal selective spectral transmittance in the visible wavelength range and the highest reflection in the infrared wavelength range. For this system, Ag can keep its optical characteristics after heating at 200 degrees C by the protection of the thick ZnS layer. The system consisting of 15 nm ZnS/10 nm Al is the most efficient heat mirror of the ZnS/Al systems.