(1) This plan integrates the past results of crab breeding, seedling experiment and breeding and fattening of mud crab Scylla serrata, and plans to build a breeding field suitable for crab breeding.(2) Through water quality, algae color, and feeding management, the first stage crab seedlings of 500,000 zoea larvae were cultivated at a density of 10,000 per ton of water. On the 16th day of cultivation, the zoea transformed into megalopa. It is estimated that the number of breeding is about 25,000, and the continuous breeding metamorphosis is about 2564 benthic juvenile crabs, and the breeding rate is about 0.51%. (3) In the 4th month of stocking, the average weight of blue crabs is 248.1±71.5g, and the crabs with an intermittence weight of 250g or more will be fattened by the independent box culture system. As of November 12, the total number of harvests was 342. Continued to be carried out, and the whole pond was harvested in December.