Pour a proper amount of purified water into a clean oil-free container with a lid, rinse the dust on the lower surface of the sea cucumber with clean water, soak it until it becomes soft, and clean the impurities in the belly of the sea cucumber, then cook it with strong fire, put the cooked sea cucumber into a clean oil-free container, add purified water to the sea cucumber, and put it into the refrigerator and change the water once a day.