Abstract: Rice was used as the medium for the fermentation of Cordyceps militaris in this study. The differences between nutrition and functional components and anioxidant activities of ricesbefore and after fermentation were analyzed.The antioxidant activities of Cordyceps militaris rice were also studied by various antioxidant assays,including reducing power,superoxide anion radical,hydroxyl radical and DPPH free radical scavenging. Results showed that compared with ordinary rice,rice fermented by Cordyceps militaris not only contained functional ingredients cordyceps acid and cordyceps which were existed in the latter,Cordyceps rice also contains higher content of SNSP,the SNSP,cordyceps acid and cordyceps content of Cordyceps rice were 8.39%,18.07 mg / g and 8.76 mg / g.The antioxidant results showed that compared with ordinary rice extract,Cordyceps rice extraction had significant free radical scavenger and total antioxidant capacity,when Cordyceps rice was extracted at a concentration of 5 mg / m L,for O_2~-·,·OH and DPPH· scavenging rate were 40%,38% and 79.1%,in the extract concentration of 0~5 mg / m L and dose proportional.This suggested that the Chinese caterpillar fungus meters has certain antioxidant capacity,thus provided the basis for further research and development of functional Cordyceps products.