Abstract: A method for the simultaneous determination of 6 organic amines including methylamine, ethylamine, dimethylamine, diethylamine, trimethylamine and triethylamine in soil by gas chromatography-mass spectrometry after headspace was proposed. The soil sample was extracted with hydrochloric acid solution in headspace bottle, and a certain amount of sodium hydroxide solution and aqueous ammonia was added, and then equilibrated at 80℃ for 30 min in headspace sampler to make the dynamic equilibrium between gas phase and liquid phase. The target compounds were separated on CP-Volamine chromatographic column, detected by mass spectrometer, and quantified by external standard method. It was shown that linear relationships between values of mass concentration and peak area of 6 organic amines were kept in the definite ranges, with detection limits (3.143s) in the range of 0.000 33-0.18 mg·kg^-1, and RSDs (n=6) of the determined values of 6 organic amines in the mixed standard solutions were ranged from 2.3% to 4.7%. Test for recovery was made on the blank sample at 3 concentration levels by standard addition method, giving results in the range of 80.0%-108%. This method was applied to analysis of the actual samples, the detection amount of triethylamine was 11.3, 391 mg·kg^-1 in two soil samples.