Abstract: This paper studied on oat oil from deshelled oat seeds by petroleum ether extraction.After saponification,non-saponifiable matter was extracted .GC/MSD identification showed that the principal composition was β-sitosterol.according to adding-test and bacteriostatic test,we found that β-sitosterol had some antioxidant and bacteriostatic effcts.And the function was enhanced when its concentration was increased.

Key words: Deshelled-oat seed , Oat oil , β-sitosterol , Antioxidant test , Becteriostatic test.