In view of the detection of trace impurity elements in gutter oils,a gas chromatography-mass spectrometric(GC-MS) method was proposed for the analysis of the chemical compositions in condiment.The experimental results revealed that acetic acid derives from vinegar,3-butene nitrile from pickles sauce,allyisothiocyanate from mustard,furfural derived from soy sauce,anethole from star anise and zingiberene from ginger.Eat hutch waste oil could be identified by confirming the existance of these characteristic compositions in oil samples.In this paper,headspace solid phase microextraction(SPME) was applied to enrich the trace exogenous impurity elements,and a dedicated gas chromatographic column was also developed.Six-ingredients,including acetic acid,3-butene nitrile,furfural,allyisothiocyanate,anethole and zingiberene were determined by this GC-MS technique.If one or more these trace elements were detected in the sample,it could be identified as eat hutch waste oil.