Oil body is a spherical mass of liquid tri-acylglycerols surrounded by half unit membrane, and it owns good stability as a kind of natural emulsion. The structure and components of seed oil body, the variety and characteristics of proteins associated with oil body were summarized, and the research progress in oil bodies' extraction and purifying technology at home and abroad suiting for their application were focused on. Its properties and potential application in different fields, especially the exploitation research in food industry were elaborated.