Highly oriented VO2 thin films were deposited on sapphire substrate and PcNi thin films were spin coated onto VO2 thin films. The microstructure of VO2 thin films were studied with XRD. The phase transition was observed and the change in the optical properties of the PcNi/VO2 multilayer-films were investigated. It was found that the mid-infrared transmittance of the complex films from 1.5 to 5.5 mu m wavelength was raised with PcNi film coating. The thermochromism of PcNi/VO2. films was not changed compared with VO2 films and the transition temperature was same to that of VO2. (c) 2004 Published by Elsevier B.V.