Sea cucumber, belonging to the class Holothuria, is a kind of marine echinoderm living at the seaside up 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 sea cucumbers along the coast of the South China Sea, about 20 of which are edible. Sea ginseng, bird's nest and shark's fin are equally famous, and it is one of the eight treasures in the world. Sea cucumber is not only a precious food, but also a precious medicinal material. According to "Compendium of Materia Medica", sea cucumber is sweet and salty, which has the functions of tonifying kidney and essence, absorbing urine and strengthening yang, treating impotence, and being warm and nourishing, so it is named sea cucumber. Sea cucumber has the functions of improving memory, delaying gonadal aging, preventing arteriosclerosis and resisting tumor. With the popularization of knowledge about the value of sea cucumbers, sea cucumbers gradually enter people's dining tables. The living environment determines the quality of sea cucumber.