Fresh crabs are expensive, and raw crabs are hard to preserve, let alone cooked crabs. No matter how it is preserved, it will lose its original flavor. Relatively speaking, they can only be frozen in the refrigerator with plastic wrap. Seafood is best eaten now, cooked and eaten now, especially crabs. Also, remember not to buy dead crabs. Dead crabs may breed a lot of bacteria. Don't put them in the refrigerator for too long after they die. If raw crabs need to be preserved, it is best to freeze them in the refrigerator, but it will affect the taste and is not as delicious as fresh ones.