Abstract: Benzene series (BTEX) usually include aromatic compounds such as benzene, toluene, ethylbenzene and xylene. In general, natural gas contains trace benzene series. In natural gas production and processing, it is important to detect the content of benzene series components and predict natural gas dew point/hydrocarbon content. Through the experiment, the method of analyzing the content of benzene series by gas chromatography is established, the qualitative repeatability (RSD₇) of each benzene series is not more than 0.01%, the quantitative repeatability of benzene and toluene (RSD₇) is not more than 2.5%, the quantitative repeatability of ethylbenzene and xylene (RSD₇) is between 7% and 11%, and the minimum detection limit of each component can reach about 2×10^-10 g/s, and the separation degree of para-xylene and m-xylene is 2.2. The feasibility and applicability of the method are verified by analyzing the actual natural gas sample, and the obtained conclusion can provide technical reference for accurately detecting the benzene content in natural gas, which can provide basic data for accurately predicting hydrocarbon dew point by using natural gas composition data, and has practical significance for the process design of the dealkylation unit of the natural gas treatment plant and the safe operation of the gas pipeline.