Abstract: In order to reveal the behaviors of aluminum ion deposition in inorganic coating process for titanium white,the spectrophotometric method was used to confirm the pH range of deposition for different aluminum salts,and the number of particles and particle size were monitored by the online particle detector in the precipitation process of aluminum ion.Furthermore,the precipitates obtained at different acidity conditions were analyzed by FT-IR,SEM and XRD to determine their characteristics. This research can provide a reference for inorganic coating of titanium dioxide.