Abstract: A new method was developed to determinate decabrominated diphenyl ether (decaBDE) in gas particle samples. The samples were extracted by Soxhlet method to accumulate decaBDE, and analyzed using high performance liquid chromatography (HPLC) with ultra-variable wavelength (UV) detector. The optimum conditions were attained as follows: the extracted reagent was a mixture of acetone and hexane (the ratio of 1∶2), and extracted time was 48 h. A ODS-BP C₁₈ column was used, methanol-water (97∶3) was used as mobile phase, the flow rate was 1.0 mL/min，the wavelength of detector was 226 nm. Linearity was observed well as y = 1.783 1x+13.248 in the range of 10 ~ 200 μg/g, and the coefficient of correlation (R²) was 0.997 6. The average recoveries ranged from 90.0% to 103.3%,and the relative standard deviations (RSD) were less than 5.0%. The limit of detection (LOD),  was 0.53 μg/g, and the limit of quality (LOQ) was 1.77 μg/g