This paper reports the fluorescent properties of Y8+ complex with 1,4-dihydroxyant-hraquinone(l,4-DHAn). The optimum conditions for the fluorimetric determination of Y8+ and interference of coexisting other rare earth ions have been investigated. The optimum conditions for the determination of less than 8ug Y8+/ml -were : pH 5.5, 8.0×10-5 mol/L 1,4- DHAn, 76% EtOH, excitation at 562 nm and fluorescent detection at 584 nm,Y- 50 filter must be setting in the excitation side for remove interference of ligand f...