When the tide is full from July to August, they lay eggs. After laying eggs and incubating for about 50 days, the larvae move to the muddy land. In the mire, peeling grows. After 15 to 16 times of repeated peeling in 10 years, they grow into adults. Move to the sandy land and continue to lay eggs for generations. The diversity environment along the estuary is a necessary factor for the survival of horseshoe crabs.