The experimental electronic spectra of the Eu3+ ion in three groups of the Eu complexes (beta-diketo- nates, acetates, and nitrates) with the 1,10-phenanthroline derivatives were used to calculate the crystal field parameters for the model of the nearest environment of this ion with the C-2v, point group symmetry. It was shown that these parameters can be used for estimating the coordination number of the metal cation and establishing the structural peculiarities.