First, change the small-water culture to large-water culture. Freshwater surface water is fresh and fresh, with large wind surface, high dissolved oxygen, rich natural food, and large size, good color, and high economic value. Therefore, crab water should be at least 3.3 hectares. Second, artificial feeding is changed to reproduce natural food. The method is: transplant enough aquatic plants into crab ponds to make them close to the natural ecological conditions, and invest a certain amount of fresh mixed fish, shrimps, snails, oysters, etc., and allow them to reproduce naturally, so that crabs can freely ingest food. When the quantity is insufficient, Timely supplements. Third, change one year listing to two years listing. At present, most of the crab breeding is the feeding of young crabs cultivated in the early greenhouses. When the crabs were listed in the same year, the crab breeding cycle was shortened from two years to one year. Although the crab growth advantages are maximally exerted, the listed crabs are generally small in size and average in size. Only about 100 grams, poor market competitiveness, low prices, the same pond, the same crab production, due to different specifications, the economic disparity is great. Therefore, to raise the market size of crabs, we should cultivate large-size crabs in the first year and grow crabs in the second year. Fourth, to simply raise crabs for crab fish rotation. At present, many crab ponds have been continuously raising crabs for many years, and there are few natural trace elements in the water body. With the accumulation of crab excrement, water quality deteriorates, and there are many pathogenic bacteria. The incidence and mortality of crabs are high in the breeding process, and the aquaculture production is declining year by year. Therefore, in order to maximize the benefits of the pond, it is possible to implement crab fish rearing, raise crabs in the first and second year, and fish in the third year to reduce economic losses.