Winter worm, summer grass (scientific name: Ophiocordyceps sinensis), also known as Chinese Cordyceps, is a traditional Chinese history of valuable Chinese medicinal herbs, by the botrytis order of serpentine Cordyceps family serpentine Cordyceps genus of Cordyceps fungi parasitized in the alpine meadow soil of the manta moth larvae, so that the larvae body ossification. And in the appropriate conditions, the summer from the head end of the stiff worm extracted long rod-shaped cysts and formed, that is, the Cordyceps sinensis fruiting body and stiff worm nucleus (larval body) constitutes the complex. Cordyceps is mainly produced in mainland China in Qinghai, Tibet, Sichuan, Yunnan, Gansu and Guizhou provinces and autonomous regions in the alpine zone and snowy mountain grasslands.