Wash and soak in pure water until the salty flavor is removed, about 12-36 hours. Put the soaked sea cucumber into the pressure cooker, pour in water, choose the steaming time according to the size of the sea cucumber (fifteen minutes for large sea cucumbers, ten minutes for medium sea cucumbers, six minutes for small sea cucumbers), turn off the fire, wait for five minutes and put the sea cucumber out into the pure water to soak for 1-2 days, and put it into the refrigerator to eat at any time.