Objective To establish a GC-MS method for the detection of 1,3-dichloro-2-propanol（1, 3-DCP）and 2, 3-dichloro-1-propanol（2, 3-DCP）in soy sauce by using a head-space solid phase micro-extraction device. Method Extracting 1, 3-DCP and 2, 3-DCP from soy sauce in 50 ?C water bath for 30 min with a Carboxen^TM/Polydimethylsiloxane（CAR/PDMS，75μm）fiber. The fiber was then transferred to the injection port of GC – MS to allow the analyte absorbed and separated by DB – WAX capillary column (30 m×0.25 mm×0.25 μm) and detected by mass spectrometry. Using d₅-1,3-DCP as internal standard for quantification. Results The linear range for 1, 3-DCP and 2, 3-DCP was 5-160 μg/kg, and the detection limits were 2.0 μg/kg and 0.5 μg/kg respectively. The recoveries of standard addition at 5μg/kg, 20μg/kg and 50μg/kg were in the range of 82.9 % - 103.0 %, and the relative standard deviations (RSD, n=7) were in the range of 2.5 % - 10.6 %. Satisfactory results were obtained in the detection of 1, 3-DCP and 2, 3-DCP in soy sauce samples. Conclusion The method is simple, fast, accurate, sensitive, and suitable for the determination of 1, 3-DCP and 2, 3-DCP in soy sauce.