According to the different breeding methods and specifications, the stocking density can be set as: 1). Soft-shelled turtle is directly bred by fry, with an average density of 15/m2, and the stocking density in the early stage is 30/m2. 2) Turtles are cultivated by seedlings, with an average of 25 turtles per square meter, and the stocking density in the early stage is 50 turtles per square meter. 3) From soft-shelled turtle culture to adult turtle culture, the intensive culture in cement pond is 5 per square meter, and the intensive culture in mud pond is 5 per square meter 1. The selection of fry quality requires that the fry quality of Trionyx sinensis is disease-free and injury-free, with neat specifications, strong vitality, fresh and tender body color, excellent varieties and clear sources. Do not raise overseas turtles that have not been quarantined by the customs or whose sources are unknown. Preparation before stocking 1. Cleaning and disinfection of ponds: Before stocking, the breeding ponds must be carefully cleaned and disinfected. Generally, the disinfection of the environment and pond in the factory chemical control greenhouse can be achieved by draining the pond water to dry the bottom of the pond, and then directly spraying 400-500 times of Qiangmieling 10 day before stocking. Outdoor, if the pond is cement-intensive, it can be disinfected with strong hydantoin and water 10 days before stocking. If it is an outdoor soil pond, you can drain the water at the bottom of the pond first, then add 20-30 kg of quicklime and 0/5-20 kg of sodium humate/kloc (black soil) per mu, and expose it to the sun until it cracks (if it can't be dried). 2. Pond water for fertilization: The fry of soft-shelled turtle must be put into a pond with rich water, which has a certain degree of fat and green water quality, so that the fry will feel safe after being put into the pond. In particular, there is a certain amount of plankton in the fat water for fry to swallow, which can promote growth. At the same time, cultivating a certain biomass has a positive effect on controlling the number of some pathogenic microorganisms. Therefore, it is forbidden to put fry in clear water pond before stocking.