〔Abstract〕 Objective To investigate the effect of hysteroscopic electroresection of uterine scar diverticulum, hysteroscopiclaparoscopic combined with folding and suture repair of uterine scar diverticulum and levonorgestrel-releasing intrauterine system (LNG-IUS) in the treatment of prolonged menstrual period caused by cesarean scar diverticulum (CSD) after cesarean section. Methods A total of 105 patients with prolonged menstrual period due to CSD diagnosed and treated in the First Affiliated Hospital of Xiamen University from January 2018 to January 2022. According to different treatment methods, they were divided into 47 cases with hysteroscopic electric resection of uterine scar diverticulum (hysteroscopic group) , 35 cases with hysteroscopic-laparoscopic combined with folding and suture repair of uterine scar diverticulum (hysteroscopic-laparoscopic group) and 23 cases of LNG-IUS treatment group (LNG-IUS group). The menstrual improvement and treatment efficiency of the three groups of patients were compared after treatment. Results 12 months after treatment, the duration of menstrual period in LNG-IUS group was shorter than that in the hysteroscopic group and the hysteroscopic-laparoscopic group, and the differences were statistically significant (P < 0.05). The operation time and hospitalization days in the hysteroscopic group were shorter than those in the hysteroscopiclaparoscopic group, and the intraoperative blood loss and hospitalization cost were less than those in the hysteroscopic-laparoscopic group, with statistical significance (P < 0.05). The direct medical cost of LNG-IUS group was lower than those of the hysteroscopic group and the hysteroscopic-laparoscopic group, and the differences were statistically significant (P < 0.05). Conclusion The three methods can effectively improve the symptoms of prolonged menstrual period caused by CSD. LNG-IUS treatment is simple, economical and safe, and can be used as the priority selection for patients with no fertility needs.