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NiO[sub x]H[sub y] films were prepared by DC magnetron sputtering in H[sub 2]/O[sub 2] atmosphere. NiO[sub x]H[sub y] coatings with transparency and high electrochromic efficiency were obtained by changing H2 content. A 60nm thick NiO[sub x]-H[sub y] film with transmittance of 0.57 (as-deposited state), 0.78 (bleached state) and 0.24 (coloured state) at wavelength of 550nm was deposited in an atmosphere of H[sub 2](60%) + O[sub 2](40%). Analysis of infrared spectra (6000∼2400cm[sup -l]) showed that the absorption peaks for bleached and colored states are associated with free 'OH' and OH stretching vibrations, respectively. XPS Ni2p core level spectra of colored NiO[sub x]H[sub y], film exhibited a peak at 856.2±0.2eV which is attributed to Ni[sup 3+]. Ni2p core level spectra of the bleached and as-deposited films exhibited two peaks at 856.4±0.2 and 854.6±0.2eV which are attributed to Ni[sup 3+] and Ni[sup 2+]. [ABSTRACT FROM AUTHOR]