The most important thing to steam crabs is to keep them fresh, and steaming them is not too much. The most common problem in the process of steaming crabs is that the meat is neither fresh nor sweet because it takes too long or too little time and there are parasites. The steaming time of crabs cannot be generalized, because the time required for a whole crab and a diced crab is completely different. The whole live crab needs to be cooked first, then steamed with high fire for about 5 minutes, and then continue to use low fire. It takes about 3 pairs of crabs to steam 10 minute, 3 ~ 4 pairs of crabs to steam 12 minute, and more than 4 pairs of crabs to steam 15 minute. Usually, for every weight gain 1, the steaming time will increase by about 2 minutes. In a word, the specific time of steaming crabs depends on the size of crabs.