Asherman's syndrome is characterized by the presence of intrauterine adhesions (IUA) as well as symptoms such as amenorrhea, hypomenorrhea, pelvic pain, and infertility. The gold standard for the treatment of intrauterine adhesions is hysteroscopic intrauterine adhesions. The recurrence of intrauterine adhesions is a major challenge in clinical practice. It has been reported that dried biological aminion graft was used to prevent adhesion after the operation of intrauterine adhesions. Estrogen is also used for postoperative prevention of intrauterine adhesions. Intrauterine balloon can reduce the recurrence of adhesions after operation. Does the combination of balloon with amniotic products or estrogen can improve clinical outcomes? Therefore, this study was conducted.

Allocation: Randomized Endpoint Classification: Efficacy Study Intervention Model: Parallel Assignment Masking: Double (participant and outcomes Assessor) Primary Purpose: Prevention

Inclusion Criteria:

• age 20-40 years；
• previously diagnostic hysteroscopy confirmed adhesion score >5， according to the American Fertility Society （AFS）classification of IUA；
• complains of menstruation disorder and reproductive dysfunction；
• informed consent.

Exclusion Criteria:

• premature menopause,
• presence of other intrauterine lesions (e.g. polyps, myoma, septa), and
• presence of severe intercurrent illness (e.g. systemic disease, coagulative disorders, severe kidney and liver diseases),
• adhesions limited to the lower uterine cavity or the cervical canal.