1. Appearance: King crab is large, with stout legs, orange-red or brown-red back shell, and obvious spots and lines. Crabs are relatively small, with slender legs, green or brownish-green back shells and few lines.

2. Nutritional value: King crab is considered as the treasure of crabs, with delicious meat and rich in protein, vitamins and minerals, especially zinc and selenium. The meat of crabs is also delicious. Relatively speaking, the meat quality of king crab is fuller.