利用共振激发技术和电场电离（EFI）方法研究了铕(Eu)原子偶宇称高激发态。实验共探测到89个态，其中报道了56个态的能级位置和光谱归属等信息。经过对有效主量子数和量子亏损进行理论分析，并结合文献结果的对比，不但认定它们属于4f76s(9S) np（8PJ或10PJ）里德伯系列，还填补了该系列中n=19~39各态的文献空白。另外，建议将Eu原子第一电离限修正为45734.2 cm-1，同时解释了在其附近所观察到的宽峰的物理机制。

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.