Abstract: Borosilicate sintering aid,rare-earth Gd and Ce oxides were doped into BaTiO₃（BT）-Nb₂O₅-ZnO system in order to obtain the X7R materials sintered at intermediate temperature.The experiment results show that the dielectric constant at room temperature will first drop and then increase with the increase amount of Gd doped alone,whereas,when Gd and Ce Co-doped,the dielectric constant at room temperature show a steady increase.This can be explained by the change of the occupational sites of Gd in perovskite structure.When the doping amount of Ce increase,the dielectric constant at room temperature declines,this corresponds with the core-shell structure theory.The SEM test shows that the grains of Gd and Ce Co-doped BT ceramics grow bigger than that doped only with Gd or Ce,furthermore,it also has lower porosity and higher density.