Hysteroscopy is a minimally invasive gynecologic treatment technique that can be used to diagnose, treat and follow up intrauterine cavity lesions. Hysteroscopy not only determines the site, size, appearance and scope of the lesion presence, but also provides meticulous observation of the tissue structure on the surface of the lesion and takes material under direct vision, which greatly improves the accuracy of diagnosis of intrauterine cavity diseases and updates, develops and makes up for the deficiencies of traditional treatment methods. For example, the diagnostic accuracy of hysteroscopy and biopsy reaches 100%, while the diagnostic accuracy of scraping is only 65-70%; hysteroscopy can also perform vaginal and uterine cavity examination on young girls and unmarried women to detect abnormalities there in a timely and accurate manner, and at the same time carry out the corresponding treatment without damaging the integrity of the hymen, so as to reduce the pain of patients. Indications for hysteroscopy: 1. Abnormal uterine bleeding. Examples include excessive menstruation, prolonged periods, irregular vaginal bleeding, and bleeding before and after menopause. 2.Evaluation of abnormal uterine echogenicity or occupancy on ultrasound. 3.Evaluation of abnormal hysterosalpingogram. 4.Location and removal of intrauterine device (foreign body in the uterine cavity). 5.Diagnosis of uterine adhesions. For example, decreased menstrual flow and lower abdominal pain during menstruation. 6. Unexplained infertility, recurrent spontaneous abortion, etc. Indications for hysteroscopic surgery: 1, endometrial resection (TCRE) 2.Endometrial polypectomy (TCRP). 3.Treatment of uterine adhesions (TCRA) 4.Longitudinal resection of uterus (malformation) (TCRS) 5.Uterine submucosal myomectomy (TCRM). 6.Transcatheter hysteroscopic tubal cannulation and evacuation.