ZnO　nanorods　were　decorated　by　Cu　nanocrystals　via　magnetron　sputtering　to　form　Cu/ZnO　nanocomposite　arrays.　The　crystal　structure　and　morphology　of　Cu/ZnO　nanocomposite　arrays　were　characterized　by　XRD　and　SEM.　The　optical　absorbance　of　Cu/ZnO　nanocomposite　arrays　was　measured　using　a　UV-vis　spectrophotometer　and　their　potential　applications　were　discussed.