There are different degrees of light dry sea cucumber processing. Pure dry processing is more refined and has the lowest water content. Pure dry sea cucumber is very small, but its hair output can reach 15- 18 times. Ordinary light dry sea cucumber is generally more than 10 times, and light dry sea cucumber is dry sea cucumber with a salt content of 5%- 10%, which is the main product of sea cucumber at present, and also the best dry sea cucumber with high water yield. The epidermis and feet of light dry sea cucumber are clear and good, and the appearance is black or gray. Generally speaking, pure dry sea cucumber is the deep processing of light dry sea cucumber.