Abstract: Cesarean section scar pregnancy（CSP） is a rare but serious complication. The incidence of Cesarean Section is increasing year after year. CSP occurs in women with previous uterine scar when implantation takes place at the site of this scar. CSP is also one of these possible complications that may lead to rupture of the uterus，bleeding and may endanger the woman’s life and even her fertility are at risk. Early diagnosis is possible with high level of suspicion and with the aid of high quality ultrasound scanning. The therapy includes： MTX treatment locally or systematically， dilation and curettage， laparoscopy， Hysteroscopy， uterine artery embolism， and hysterectomy. Different patient needs appropriate treatment. If treated appropriately，the prognosis may be fairly good. Here is a review of the advanced study of CSP.

Key words: Pregnancy, ectopic, Diagnosis, Methotrexate, Laparoscopes, Hysteroscopes