The condensates are important oil resources generally reserved in deep layers and mainly composed of light hydrocarbons. In this study, 10 condensates samples were collected from the Southwest Depression of the Tarim Basin, and treated with the purge-and-trap and headspace single-drop microextraction (HS-SDME) techniques to study the chemical and carbon isotope composition of the C6-14 hydrocarbons. The relative amount of C6-14 hydrocarbons is significantly different between the samples. But there is still a good linear relationship between each two of the C6-9/C10-14, nC6-9/nC10-14 and iC6-9/iC10-14 ratios, indicating that the n-alkanes and isoalkanes (including aromatics) are approximately evaporated with the same ratio. And the relative amount of C6-14 n-alkanes in the samples is deceased as the depth increasing. The δ13C values of the C7-14 n-alkanes are in a range of -30.5‰∼-25‰, and consistent with the δ13C values of C14+ n-alkanes that have been reported earlier. The depth might have an unpredicTable effect on the δ13C value when it is over 6000 m, because the samples with the highest and lowest δ13C values all come from the layers at similar depths. This work might suggest that the purge-and-trap and HS-SDME techniques were practicable and reliable methods to study the light hydrocarbons in condensates, and the results could improve the understanding of the condensates from the study area.