In this work, the composition and content of fatty acid in the vegetable oils and fats were analyzed and investigated. Qualitative and quantitative analysis of fatty acid in nine kinds of vegetable oils, sixteen kinds of binary mixts, seven kinds of vegetable oils in the position of Sn-2, and soybean oils and peanut oils after freezing and fractionation were achieved respectively by gas chromatography. Different kinds of pretreatment methods for discrimination of different vegetable oils and fats we...