Electron-doped superconductor Eu1.85Ce0.15CuO4+α-δ has been synthesized using solid state reaction method. The purpose of this research is to study the effect of heating process with and without annealing treatment to its superconductivity. The sample without annealing treatment was covered by CuO to prevent the excess of oxygen in sample during heating process. All samples were characterized by XRD, resistivity and susceptibility measurement to study structure, electrical and magnetic properties of Eu1.85Ce0.15CuO4+α-δ samples with different heating process. From XRD measurement, it is found that all samples have tetragonal crystal with T' structure. From magnetic susceptibility and resistivity measurement, superconductivity was observed only in the sample with annealing treatment. The absence of superconductivity in sample without annealing was probably due to the existence of excess oxygen.