A stochastic approach has been used to investigate the pit generation process on anodized titanium with a multi-electrode in a flow channel. The distribution of measured pitting potentials follows approximately the normal probability distribution and the distribution range of the pitting potentials shifts in the noble direction with increasing flow velocity. The pit generation process was found to proceed by the parallel birth and death stochastic model. The pit repassivation rate determined by this model increases with increasing flow velocity while the pit generation rate shows no dependence on flow velocity. Thus, the increase in the pitting potential with flow velocity is attributed to the increase in the pit repassivation rate. This fact indicates that the transport of the chemical species, such as H + and Br - ions, within the pit to bulk solution controls the pit repassivation process. The stochastic approach is considered to be one of the most effective and reliable ways for investigating the pitting corrosion of anodized titanium.