The properties of resonance fluorescence of Rhodamine G(RhG) were studied.RhG itself has a strong resonance fluorescence signal that the resonance fluorescence peak is tine and symmetry in hydrochloric acid medium,with foreign substances do not interfere with it.Based on the catalytic effect of nitrite on the oxidation of RhG by potassium bromate,a catalytic resonance fluorescence method was proposed for the determination of trace nitrite.The affecting factors of intensity of ΔF and the optimum conditions of the reaction systems were investi...