The deposition of atmospheric dust on the surface of the reflector of concentrating solar power (CSP) reduces its specular reflectance efficiency and requires frequent cleaning to avoid energy-yield loss.Porous TiO2 films with natural super-hydrophilic property were successfully synthesized through the neutralization of ammonia and nitric acid which drove phase separation by sol-gel spin coating method.Surface morphology, phase structure, transmittance and hydrophilicity of the films were characterized by super depth of field microscopy, X-ray diffractometer, UV-VIS-NIR spectrophotometer and water contact angle apparatus.The results indicate that TiO2 thin films annealed at 450 ℃ for 60 minutes present excellent crystalline anatase porous structure.Moreover, porous anatase TiO2 thin films exhibit a natural super-hydrophilic property with water contact angles less than 5° under visible-light irradiation, rather than UV-light.The reflector with porous TiO2 films with remarkably easy-to-clean performance and high reflectivity shows promising application in enhancing photoelectric conversion efficiency of CSP.