Sea cucumber belongs to the class Holothuria, which is a kind of marine echinoderm living at the seaside to 8000 meters. It has a history of over 600 million years. Sea cucumbers feed on algae and plankton on the seabed. Sea cucumbers are covered with thorns and are widely distributed in the oceans of the world. There are many kinds of coasts in China, and about twenty kinds of sea cucumbers are edible. Sea ginseng, bird's nest and shark's fin are equally famous, making it one of the eight treasures in the world.