V-doped TiO2 porous films had been prepared on glass substrates via sol-gel method using polyethylene glycol (PEG) as organic template. The model concerning the pore formation and change of the band-gap was discussed. The experiment results show that the porous structure can be obtained by phase separation caused by the chain change and self-assembly of PEG molecular. Sol concentration and PEG content have important roles in porous structure formation. Moreover, the band-gap presents a gradual decrease from 3.28 eV to 2.82 eV with the increase of the V doping content from 0 to 0.2 in V-TiO2 film. (c) 2009 Elsevier B.V. All rights reserved.