A cyclodextrininduced-room temperature phosphorescence (CD-RTP) system for the determination of quinoline without deoxidization procedure was developed based on the external heavy atom effect of dibromopropane (DBP), the RTP maximum wavelengths lambda(ex)/lambda(em) = 273/496nm. The difference of heavy atom effect between dibromopropane DBP and dibromoethane (DBE) was examined and the apparent formation constants of the ternary inclusion complexes for quinoline/beta-CD/DBP and quinoline/beta-CD/DBE systems were determined. As compared with DBE, the heavy atom effect of DBP was higher and the RTP intensity was stronger. The RTP intensity was linear for quinoline/beta-CD/DBP systems with quinoline concentration in the ranges of 5.0 x 10(-7)-5.0 x 10(-5)mol/L and 5.0 x 10(-5)-5.0 x 10(-4)mol/L, respectively. The detection limit was 7.8 x 10(-8)mol/L. The determination precision was satisfactory.