Two analytical methods for the detection of iodinated trihalomethanes(I-THMs) in drinking water by purge and trap(P&T) with gas chromatography-mass spectrometry(GC-MS) and liquid-liquid extraction with gas chromatography-electron capture detection(LLE-GC/ECD) were compared.The results showed that the LLE-GC/ECD method using methyl tert-butyl ether(MTBE) as extractant was more suitable for the qualitative and quantitative analysis of I-THMs.The linearity was observed in the range of 0.5-1 000 μg/L for 6 I-THMs quantified by internal standard,with correlation coefficients(r2) more than 0.99.The developed LLE-GC/ECD method showed a good repeatability with relative standard deviations(RSD,n=7)of 3.9%-6.4%.The limits of detection(LODs) were between 0.05 μg/L and 0.11 μg/L.Recoveries of I-THMs in surface water filtered source water,and tap water at spiked levels of 0.5,2.0,10.0 μg/L were in the range of 81.2%-108.6%,with RSDs of 2.6%-7.7%.The method was simple,rapid and sensitive,and could be well suited for the determination of I-THMs in drinking water.