We report on X-ray photoemission (XPS), Bremsstrahlung isochromat (BIS) and 4 f resonant ultraviolet photoemission (4 f RPES or UPS) spectroscopy of Ce(Pd 1- x Cu x ) 3 (0≤ x ≤0.133). With increasing x , the 4 f 1 BIS peak clearly observable in CePd 3 is strongly depressed, the 4 f 2 BIS peak is found to shift to lower energies and the intensity of the 3 d 9 4 f 0 component of the Ce 3d core XPS is found to become weaker. These experimental results are discussed in comparison with the spectra calculated by using the impurity Anderson model. It is found that lowering of the 4 f level energy e f along with reduction of the 4 f hybridization strength V with x can qualitatively reproduce the experimental result. It is also strongly suggested that the 4 f -4 f Coulomb energies are different for the 4 f BIS and 3 d XPS final states.