The Zn²⁺-doped nanocrystalline anatase-type TiO₂ film electrodes were prepared by sol-gel method. The photoelectric properties of the electrodes with different concentration of Zn²⁺ were studied by photocurrent action spectra and current-potential (I-U) curves. According to the action spectra,the concentration of Zn²⁺ can affect the photocurrent magnitude remarkably and its optimum is dependent on the particle-size of T1O₂. Illuminated by 320 nm monochromatic light,Zn²⁺-doped TiO₂ film electrode with the concentration of 0.1 mol% produced the largest photocurrent which increased 40% compared with which produced by undoped electrode. The I-U curves show that the conversion from anodic current to cathodic current occurs in all illuminated TiO₂ film electrodes during the potential dropping from 1.OV to －0.4V,and the onset potential of anodic current was affected by the concentration of Zn²⁺. In the region of cathodic potential,in addition,similar cathodic dark current was observed for each electrode and it increased rapidly with a dropping potential.