YBa2Cu3O7-6 superconductor films have been prepared on silver substrates by electrophoretic deposition. As silver does not react with YBa2Cu3O7-6 compound and has little influence on its superconductivity, it is usually doped in YBa2Cu3O7 to improve the strength of the material and eliminate micro cracks. It has been proved that Ag additive can lower the melting temperature of YBa2Cu3O7-6 and act as linking bridge among YBa2Cu3O7-6 particles, thus in this paper Ag doped YBa2Cu3O7-6 thick films are prepared by electrophoretic co deposition. As there are only some referenced experience formula and models for co electrophoretic deposition and does not exist unified explanation, the behavior of Ag particles during co electrophoretic deposition is also studied.