1, Look: the crab's back carapace is bluish-gray, shiny, its abdomen is white, its color is bright, there is no imprint on the upper part of the umbilicus, and its limbs are firmly connected in a curved shape.

2. Weigh: For the sea crabs whose appearance meets the requirements by eyes, weigh their weight by hand one by one, and the ones that feel heavy or heavy are fat crabs.

3. Peeling: Peeling off the umbilical cover of the sea crab. If the crab yolk condenses and forms in the shell, the crab is a good crab.

4, pull: the legs of the sea crab are intact, and the leg of the crab is slightly elastic, indicating that it is a fresh sea crab; If the crab is not fresh, gently pulling the crab leg will not only have no weak force, but also the crab leg will easily break off.

5. Smell: If you smell the fishy smell of sea crabs, it means that the sea crabs have gone bad and can no longer be eaten. Eating spoiled sea crabs can easily cause food poisoning.