The green seaweed on the seashore is Undaria pinnatifida, belonging to Phaeophyta, Phaeophyta, laminariales, Phaeophyceae and Undaria. Undaria pinnatifida is an annual seaweed plant, yellow and brown in color, 1-2 meters high and 5-1 mm wide, with pinnately lobed leaves and thinner leaves than kelp, so it is named after it.

Undaria pinnatifida is not only an edible economic brown algae, but also can be used as a raw material for comprehensive utilization to extract alginic acid. Undaria pinnatifida is a natural treasure house of trace elements and minerals, containing more than a dozen essential amino acids, calcium, iodine, zinc, selenium, folic acid and vitamins A, B, C and other minerals. Undaria pinnatifida contains 1 times as much calcium as "king of calcium supplementation" milk, and 3 times as much zinc as "expert of zinc supplementation" beef.