Abstract: Indium-tin oxide(ITO) films were prepared by reactive magnetron sputtering on polymer matrix composites substrates.The resin with the lowest infrared emissivity was selected as the matrix of the composites substrates.The infrared stealth properties of the material were studied by the surface characterization of the material and the test of surface resistivity and infrared emissivity.With increase of the ITO film surface resistivity,the infrared emissivity of the material increases first,then tends to a certain value.