Ternary europium complex Eu ( BA)3 Phen and quaternary europium complex Eu ( BA) ( TTA) 2 Phen were synthesized with ligands of benzoic acid, a-thenoyltrifluoroacetone (TTA) , and o-phenanthroline. Rare earths fluorescent falsification-resistant ink was prepared with the synthesized fluorescent agents. IR spectrum analysis showed that these complexes collocate with Eu ions. Luminescence properties of the inks and the complexes were determined. The results showed that the emission wavelength is 614 nm; the ink is invisible under visible light, and appears red under UV light.