Abstract:Rapeseed oil，flaxseed oil and yak ghee were used to prepare the blend oils according to the mass ratios of yak ghee ∶flaxseed oil∶rapeseed oil at 1 ∶2 ∶7（A），1 ∶1 ∶8（B）and 2 ∶1 ∶7（C），respectively.The optimal conditions for the solubility of yak ghee in the three blend oils were determined by single factor test and orthogonal test.The fatty acid composition of the three blend oils and their precipitates was analyzed by gas chromatography-mass spectrometry（GC-MS）.The results showed that the three blend oils had no peculiar smell，with the acid value and peroxide value meeting the national standards of edible oils，demonstrating high quality and strong stability and 44 of fatty acids were detected in all the blend oils and their precipitates.The number of fatty acids detected in single samples ranged from 39 to 44.A total of 8 branched chain fatty acids were detected，which had the highest content（2.92%）in the blend oil C.The main fatty acids in the three oils included palmitic acid，linolenic acid，linoleic acid，and oleic acid.The ω-6/ω-3 ratios varied within the range of 1.29-1.80，From the perspective of nutritional value，the ratio of ω-6 fatty acids to ω-3 fatty acids in mixed oil A was closer to 1∶1.