Abstract: A procedure for qualitative and quantitative analysis of organic sulfur compounds in natural gas has been established. Chromatographic methods and selective chemical reactions have been used to determine the boiling points and structures of the sulfur compounds. Relative retentions of 12 S-compounds on 4 different liquid phases were given. Experiments on 4 compounds containing different S-group indicate that within certain concentration range, the responses of FPD as expressed by h1/2.w is independent of the nature of the S-group. Thus, a single calibration curve can be used to determine all S-compounds. Comparing with other methods, satisfactory results of qualitative and quantitative analysis of three representative natural gases in Sichuan gas fields have been obtained.