The even-parity highly excited states of europium (Eu) atom have been investigated with resonant excitation and electric field ionization (EFI) method. Among the 89 states detected, the information about level energy and spectral assignment of 56 states have not been reported previously. A combination of analysis of their effective principal quantum numbers, quantum defects, and the comparison with literature, enable us to classify them as the 4f76s (9S) np (8PJ or 10PJ) Rydberg series, which fills the gap in previous literature for the n=19~39 states of the series. Besides, the ionization limit of Eu atom is suggested to be at 45734.2 cm-1, near which the existence of a broad pedestal is also explained.