2, buy a good crab cage, the general fishing gear market, the price is not expensive. The crab cage can be unfolded into a cylinder. Prepare the bait box in the crab cage. Put the bait in the bait box. Bait can be leftover shrimp skin, or you can go to the fish market to buy some fish intestines from the stall owner. Crabs like fishy smell, and the bait should have fishy smell. Tie the bait box in the crab cage and fasten the bait box tightly. After placing the bait box, tie the crab cage tightly. The mouth on the side of the crab cage is convenient for crabs to climb in and out. Throw the crab cage into the sea (the distance and place are suitable, and it is best to find crabs nearby).