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TiO2/ZrxTi1−xO2 composite films have been prepared by sol–gel method and their photocatalytic activity and stability have been investigated for the first time. Their surface morphology and average surface roughness are characterized by AFM. TiO2 P25 and pure sol–gel TiO2 films have also been prepared and investigated for comparison. Films with smaller crystallite size and larger surface roughness have been obtained by introduction of ZrxTi1−xO2 intermediate layers between TiO2 layers and substrate in the composite films. The results show that the photocatalytic activity and stability of the composite films are higher than those of pure sol–gel TiO2 and TiO2 P25 films. [Copyright &y& Elsevier]