GnRH-a will be used to postpone period after vaginal repair for Cesarean Section Scar Defect（CSD） patients with adenomyosis which will be compared with CSD patients with adenomyosis who receive transvaginal surgery without GnRH-a, whether delayed period improving the CSD prognosis will be assessed.

Women with CSD complicated with adenomyosis will be enrolled in this study. They all will receive vaginal excision and suture of CSD and will be required to undergo examinations at 6-months after surgery.

Interventioned group will be subcutaneous injected of Leuprorelin to postpone period after vaginal repair. It is be assumed that temporary menopause could improve inner conditions of uterus, there would be less local inflammation reaction which would be beneficial to the scar healed.

Inclusion Criteria:

1. Clearly diagnosed with CSD complicated with adenomyosis
2. Experiencing clinical features of abnormal uterine bleeding, prolonged menstrual flow (the duration of menstruation is more than 10 days).
3. The thickness of the remaining muscular layer of CSD was less than 3 mm.
4. Normal range of blood sugar and insulin
5. No serious medical problems (important viscera function in the normal range).
6. uterine fibroids no more than 5cm
7. Sign the informed consent.

Exclusion Criteria:

1. Indefinite diagnosis.
2. Malignant tumors.
3. With severe medical problems (severe liver disease, kidney disease, respiratory diseases, heart disease or uncontrolled diabetes, epilepsy, etc., dysfunction of important organs).
4. Pregnant.
5. Mental diseases.
6. Allergy to the any ingredients of Leuprorelin
7. Unwilling to comply with the research plan.