Four types of kiwi fruit seed protein,including water-soluble,salt-soluble,ethanol-soluble and alkalisoluble protein were extracted by their different dissolving abilities. The antioxidant activities were investigated. The result showed that the contents of alkali-soluble protein,water-soluble protein,ethanol-soluble protein and salt-souble protein were 32. 26%,32. 06%,1. 45%,1. 04%,respectively. All four protein components from kiwi fruit seed had antioxidant activity. The total Antioxidant activity from strong to weak was in the following order: ethanol-soluble protein > water-soluble protein > salt-souble protein > salt-souble protein. The linear range of scavenging power on DPPH was 0. 02 ~ 1 mg / mL. In the range,the scavenging power on DPPH from strong to weak was in the following order: water-soluble protein > salt-souble protein > salt-souble protein. Therefore,kiwi fruit seed protein have the potential as natural antioxidant.