Persistent postoperative pain is a globally recognized issue that deserves attention. Cesarean section is one of the surgeries that may cause persistent postoperative pain. PSPP may affect communication between mother and baby, and may lead to postpartum depression, which has a negative impact on the daily activities and quality of life of mothers. It is an important clinical issue. The main purpose of this study is to (1) prospectively investigate the overall incidence and characteristics of persistent pain after cesarean section at 3, 6, and 12 months after surgery; (2) Use regression analysis and data modeling analysis to evaluate the relationship between perioperative variables and chronic pain in postpartum women undergoing cesarean section; (3) Analyze the relationship between chronic pain after cesarean section and postpartum depression in postpartum women.