BTEXs in water samples were determined with VF-5 ms and CP-8ms capillary-column and Headspace-Gas Chromatography/Mass spectrometer (HS-GC/MS) under modified conditions, especially with the headspace. Results show that when 10 ml flasks with water sample accounting for 60% of each flask in volume were agitated for 20 sec. at a rate of 500 r min ^-1, in the heated shaker, then kept still for 90 sec. mixed with 2.4 g NaCl in each flask and left for equilibrium for 30 min. under 60 ℃, optimal results could be obtained. The BTEXs detection limits of the method varied the range of 0.10~0.13 μg L ^-1; the standard curve correlation coefficient (r) of each BTEXs target was more than or equal to 0.999; and the sample recovery rate lingered in the rang of 98.4%～100.2% with precision being 1.41%~6.52% (n=7). All demonstrate that the method meets the requirements of organic analysis.