In this paper，total polyphenols and flavanones from wax gourd peels were extracted using ultrasonic extraction method，and the contents were determined.Further，the effect of the wax gourd peels extracts on the antioxidant capacity of flax seed oil and lard were detected with peroxide value，acid value and malonaldehyde content as oxidation stability indexes．The results showed that wax gourd peels extract can effectively delay oxidation of oil and lard，and the antioxidant activity increased with the amount of wax gourd peels extracts increasing.The antioxidant activity of crude extracts was less than butylated hydroxytoluene.