Undaria pinnatifida contains many nutrients. According to preliminary analysis, every100g of dried product contains crude protein 1 1.6g, refined fat 0.32g, sugar 37.8 1g, ash 18.93g, and various vitamins. The crude protein content is higher than that of kelp, and the taste is better than that of kelp. Undaria pinnatifida is an edible economic brown algae, and it is also a raw material for comprehensive utilization and extraction of alginic acid.