The phase composition of the anodic film formed on a Pb electrode at 0.9 V (vs. Hg/Hg2SO4) in 4.5 M H2SO4 (25-degrees-C) was analyzed by photocurrent spectroscopy, linear sweep voltammetry, and open-circuit decay curves. The experimental results show that the film is composed of o-PbO, t-PbO, PbO . PbSO4 and PbSO4. The growth rates of the components of the film are discussed.