Cesarean section uterine scar site pregnancy refers to the fertilized egg or embryo is deposited in the previous cesarean section incision scar, is a special type of ectopic pregnancy, is one of the cesarean section long-term complications, clinical rare.Larsen was equal to 1978 for the first time proposed the concept of uterine cesarean section keloidal pregnancy. In recent years, with the increase of cesarean section rate, the incidence of CSP has been on the rise.The clinical manifestations of CSP are not specific, but most of the cases are characterized by painless vaginal bleeding, and with the increase of gestational weeks, there is a risk of uterine perforation, rupture and hemorrhage. Early diagnosis is difficult, and improper treatment may lead to uncontrollable hemorrhage, or even hysterectomy, even endangering the patient’s life.Once CSP is clearly diagnosed, effective measures should be taken immediately to terminate the pregnancy. At present, there is no uniform standard for the diagnosis and treatment of CSP.