X-ray photoelectron spectroscopy (XPS) results of Ag-added. Y1Ba2Cu3O7-δ superconductors are reported. The resistivity measurements show that addition of Ag decreases Tc and broadens the transition region. The 0 1s core level XPS spectrum is doubly peaked; the peak at smaller binding energy (528.6 eV) is believed to be closely related to the superconductivity of Y1Ba2Cu3O7-δ.