Abstract: Objective To evaluate the clinical effect of LNG-IUD on preventing recurrence after hysteroscopic resection of endometrial polyps.Methods Electrical excision of endometrial polyps with the help of hysteroscopy was performed for 120 patients, who were randomly divided into trial group (levonorgestrel-releasing intrauterine system after surgery) and control group (without any treatment after surgery), with 60 patients in each group. After follow-up of 4 years, the recurrence of endometrial polyps was observed in the two groups.Results The recurrence rate of trial group was 1.6%,and that of control group was 15.0%. There was significant difference in recurrence between the two groups (P<0.05).Conclusion The hysteroscopy can be used for more definite diagnosis and treatment of endometrial polyps. And there has been a significantly positive effect of LNG-IUD proved on preventing recurrence after hysteroscopic resection of endometrial polyps.