Snails are dioecious. The method of sex identification of snails is mainly based on the shape of their right antenna. The right antenna of the male snail bends inward to the right (the bent part is the male genitalia). In addition, the female snail is big and round, and the male snail is small and long. Oncomelania hupehensis is an oviparous animal, and its reproduction mode is unique. The embryonic development and larval development of Oncomelania hupensis are completed in the mother body. It takes about a year for a fertilized egg to give birth to a small snail. Oncomelania hupensis lays eggs in batches and begins to breed in March-April every year. At the same time of producing young snails, the male and female parents mate and fertilize, and at the same time, the young snails to be produced in the next year are propagated in the mother. A mother snail can produce about 100 ~ 150 young snails every year. 1, China snail, with large shell and conical shape, whose height is greater than that of the shell mouth. Shell tip. The snail layer of the body increases. The shell surface is smooth without ridges, and the fine surface has obvious growth lines, sometimes forming folds on the snail layer. The shell surface is yellow-brown or green-brown. The mouth of the shell is oval, with an acute angle at the top, a black frame at the periphery, a simple outer lip, and a spiral wing attached to the upper part of the inner lip, partially or completely covering the umbilical foramen. Umbilical foramen is slit-shaped. Keratin is a yellowish brown oval sheet with obvious concentric growth lines, and the keratin is located in the center of the inner lip. 2, the Chinese round snail, the shell is large, oval, and the shell is thin and solid. The shell is 50 mm high and 40 mm wide. There are 6-7 spiral layers, the surface of each layer is enlarged, the width of the spiral layer is rapidly increased, and the spiral part is short and wide; The snail layer of the body is particularly large; The top of the shell is sharp and the suture line is deep. The surface of the shell is green-brown or yellow-brown. The mouth of the shell is oval, and there is often a black frame around it. The outer lip is simple and the inner lip is thick, covering the umbilical foramen. Umbilical foramen is slit-shaped.