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.