Abstract: Objective To detect the composition of 37 fatty acids in 12 edible vegetable oils（rapeseed oil,safflower seed oil,sunflower seed oil,corn germ oil,flaxseed oil,sesame oil,pumpkin seed oil,peach kernel oil,badam oil,almond oil,grape seed oil,and Chamaku seed oil） in Urumqi,conduct the detailed analysis of the content of various fatty acids contained in it,so as to determine the nutritional characteristics of different types of edible oils. Methods With synchronous optimization through preprocessing and instrument methods,the edible oil samples were treated for methylation serivatization by transesterification,and the separation and determination of fatty acid composition were performed using HP-88 special capillary chromatography column. Results The main fatty acid components in 12 types of edible oils were mainlypalmitic acid,stearic acid,oleic acid,linoleic acid,linolenic acid,and arachidonic acid. In rapeseed oil,peach kernel oil,badamwood oil and almond oil,the content of monounsaturated fatty acids（MUFA） accounted for the vast majority,and the mass fractions were >57%. In safflower seed oil,sunflower seed oil,corn germ oil,flaxseed oil,sesame oil,grape seed oil and Chamaku seed oil,the content of polyunsaturated fatty acids（PUFA） accounted for the vast majority,and the mass fractions were ≥58%. The contents of oleic acid and linoleic acid in edible vegetable oil determined in this study were high. The content of arachidonic acid in Chamaku seed oil is very high（48.386 g/100 g）. In the samples of this study,the ratios of saturated fatty acids（SFA） to MUFA were <1,while the ratios of SFA to PUFA were <1. Conclusion 12 types of edible oils have high nutritional value and good health care effect,also have good stability and security,and scientific intake of edible oil according to the needs and proportions helps to achieve a better dietary nutritional balance of fatty acids and effective health care.

Key words: Edible oils, Fatty acid, Nutritional composition