Abstract: The activated charcoal tube samplers are used to concentrate 1,2-Diflurobenzene in the environment air.Carbon disulfide is used as desorption agent.The 1,2-Diflurobenzenen in the sample is detected by capillary column GC/ECD.The relative deviation is less than 5%,the recovery ratio of the method is 97%,and correlation coefficient is 0.999 4.When the sampling volume is 20 L and influent flow is 1 μL,the minimum detection limit concentratins are found to be 0.01 mg/m³.The method is also fit for determination of exhaust gas of 1,2-Difluorobenzene.