Calcined kaolin of our company applied in electrophoretic coating has such advantages as low conductivity, low impurity content, low fineness of grind, good dispersibility, good suspension property, and good chemical stability. It can be used for enhancing sedimentary stability of electrophoretic coating, extend service life of electrophoresis chamber liquid, enhance salt fog resistance of painting film, and improve smoothness, compactness, and evenness of paint film.