Inclusion Criteria:  BMI (body mass index) ≥28kg/m2 Consent informed and signed Pathologically confirmed as endometrial atypical hyperplasia Have a strong desire to reproduce and ask for fertility preservation or those who insist on keeping the uterus despite no reproductive requirements Have good compliance and follow-up conditions, and patients are willing to follow up in Obstetrics and Gynecology Hospital of Fudan University in time  Exclusion Criteria:  Diagnosed as type 2 diabetes Diabetic ketoacidosis History of acute pancreatitis Have a history or family history of medullary thyroid carcinoma; multiple endocrine neoplasia syndrome type 2 (MEN2) Combined with severe medical disease or severely impaired liver and kidney function Patients with other types of endometrial cancer or other malignant tumors of the reproductive system; patients with breast cancer or other hormone- dependent tumors that cannot be used with progesterone Those who require hysterectomy or other methods other than conservative treatment with drugs Known or suspected pregnancy Currently suffering from pelvic inflammatory disease or diagnosed as pelvic inflammatory disease Lower reproductive system infection abnormal cervical dysplasia Congenital or acquired uterine abnormalities, including fibroids that deform the uterine cavity Allergic to any parts of LNG-IUS components The uterine cavity is too large (average diameter is over 7cm) or the history of LNG-IUS falling off