Hysteroscopic technology is an advanced gynecological diagnostic and treatment technology that has developed rapidly in recent years. It is capable of directly examining the changes in the uterine cavity and performing a variety of surgeries and treatments in the uterine cavity, which provides patients with more treatment means. Hysteroscopic technology includes hysteroscopic examination, hysteroscopic treatment and hysteroscopic resection. Indications for hysteroscopy 1, premenopausal and postmenopausal abnormal uterine bleeding; 2, diagnosing or deciding whether submucosal leiomyoma or endometrial polyp can be removed via the cervix; 3, locating or trial removal of lost intrauterine device; 4, evaluating abnormal uterine tubal iodine-oil angiography; 5, evaluating abnormal uterine echogenicity and/or space-occupying lesions on ultrasound; 6, diagnosing uterine malformation, uterine adhesions and trial separation; 7, Examining the cervical canal and/or intrauterine causes of repeated spontaneous abortions and pregnancy failure; 8, Exploring intrauterine factors of unexplained infertility; 9, Follow-up after intrauterine surgery; 10, Early diagnosis of cervical canal and endometrial cancer.