Hysteroscopy is both an examination method and a surgical method. Hysteroscopy refers to a series of tests and treatments such as examination, diagnosis and analysis of women through the hysteroscope. The process of hysteroscopy is very simple, which mainly involves the use of a very thin mirror to pass through the vagina and cervix, and put into the uterine cavity for observing the endometrial lesions and some occupying lesions in the uterine cavity, and it is a new, minimally invasive gynecological diagnostic and therapeutic technology, which can be used for the diagnosis, treatment and follow up of the lesions in the uterine cavity. Hysteroscopy can not only determine the location, size, appearance and scope of lesions, but also make detailed observation of the tissue structure on the surface of the lesions, and take material or locate the scraping under direct vision, which greatly improves the accuracy of diagnosis and treatment of diseases in the uterine cavity, and renews, develops and makes up for the shortcomings of traditional diagnostic and therapeutic methods, and is now widely used in gynecological examination. Hysteroscopy is used in the examination of unexplained vaginal bleeding, irregular menstruation, vaginal fluid, abdominal pain and infertility to exclude the presence of inflammation, tumor, foreign body, adhesion, etc. Under direct vision, local biopsy is also feasible. Under direct vision, it can also be used for local biopsy, removal of cervical polyps, removal of endometrial polyps, disintegration of cervical adhesions, removal of longitudinal uterine septum, endometrial resection, and removal of intrauterine devices or other foreign objects. To summarize, the uterine cavity can not only diagnose diseases in the uterine cavity, but also operate on diseases in the uterine cavity at the same time to achieve the purpose of treatment.