Portunus sinensis is a kind of seafood in summer and autumn, so the best seasons are summer and autumn. In China, the best season for swimming crabs is from August to October. At this time, the swimming crab is the most plump and delicious. In addition, the origin of swimming crab will also affect its quality and taste. Generally speaking, swimming crab produced in Jiangsu, Zhejiang, Shanghai and other places has good quality. Therefore, you can taste the best taste and quality when you buy swimming crabs in this season and these regions.