High-tech equipment such as high-definition, magnifying optics and cameras are used to enter the uterine cavity through the natural channels of the human body (vagina, cervical opening) for examination and surgical treatment. 1. abnormal uterine bleeding: excessive menstruation, irregular bleeding, prolonged menstruation, postmenopausal bleeding, etc.; Aiping Bian, Department of Obstetrics and Gynecology, First Affiliated Hospital of Zhengzhou University 2. abnormal intrauterine sonographic findings: ultrasound suggests abnormal occupancy in the uterine cavity (endometrial polyps, submucosal fibroids, placental residues, uterine foreign bodies, etc.); 3. foreign bodies in the vagina of young girls 4. infertility: uterine cavity status,insertion of tubal lavage 5. recurrent spontaneous abortions: Uterine malformation, longitudinal septum, uterine narrowing, endocervical relaxation, etc. and assessment; 6. amenorrhea, menorrhagia, severe dysmenorrhea: especially with previous intrauterine surgery or suspected cervical stenosis, uterine adhesions, etc.