Clinically, hysteroscopy is done by entering a mirror into the uterine cavity through the cervix and injecting a certain amount of water into the uterine cavity at the same time under the action of a magnifying glass to see the uterine cavity after dilating the uterus. The conditions that require hysteroscopy include: first, any abnormal uterine bleeding of unknown origin can be examined by hysteroscopy. Hysteroscopy can directly see whether there are endometrial polyps, submucosal fibroids, thickening of the endometrium and other abnormalities causing increased menstrual flow; secondly, if the ultrasound indicates that the uterus is malformed and the patient has a history of recurrent spontaneous abortion or infertility, hysteroscopy is recommended. Through hysteroscopy, we can find out whether there are malformations in the development of the uterus, including longitudinal, incomplete longitudinal, or complete longitudinal and whether the size of the uterus is abnormal; thirdly, the examination of the cause of low menstrual flow is mainly to exclude whether the endometrial thinning or even adhesions are caused by previous abortions or scrapings; fourthly, patients who have had abortions in the past and are found to have residual Fourthly, if the patient has had a previous miscarriage and residual tissue is found, hysteroscopy can be done to remove the residual tissue, which will relatively speaking cause less damage to the endometrium.