Undaria pinnatifida belongs to seaweed plants. It is yellow-brown in color, with a height of 1~2 m and a width of 50~ 100 mm. Its leaf margin is pinnately lobed, and its leaves are thinner than kelp. It looks like a banana leaf fan or a nepotium, so it is named. Undaria pinnatifida is a temperate seaweed, which can tolerate high water temperature. Undaria pinnatifida naturally grows mainly in Zhoushan Islands and Shengsi Island in Zhejiang Province.