Abstract: The property and value of vegetable oil are determined by the category and the content of the fatty acids,the structure of triacylglycerol(triglyceride) as well.Several kinds of vegetable oil,often used in cosmetic industry,were qualitatively analyzed by electrospray ionization mass spectrometry(ESI-MS).ESI~ mass spectrums of nine kinds of vegetable oil including tea seed essential oil were studied.(According) to m/z of ESI~ mass spectrum of vegetable oil,the molecular structure of the triacylglycerol in ...