我国的河蟹养殖一般采取人工育苗或从河曰附近捞取天然蟹苗，然后分两年养成商品蟹的方式除一年养成扣蟹，第二年养成商品蟹）。为了摸索新的养殖方式，缩短河蟹的养殖周期，试验旨在利用南北季节差异，充分利用海南优越的自然条件，为北京地区提早提供质优、价廉、数量充足的 Crab culture in China generally take artificial breeding or fishing from the river near the natural crabs, and then develop into commercial crabs in two years, except for one year to develop deduction crab, the second year to develop commodity crab). In order to explore new ways of breeding and shorten the breeding cycle of crabs, the experiment aims to make use of the superior natural conditions of Hainan by making use of the differences between the northern and southern seasons, and to provide earlier and better quality and lower prices in Beijing.