The steps of painless hysteroscopy include positioning and disinfection, anesthesia, dilatation of the uterus and examination of the uterine cavity. 1. Positioning and disinfection: the examinee takes the position of cystolithotomy, routine vulvar disinfection, spreading the towel, vaginal speculum expanding the vagina to fully expose the cervix and disinfection, using cervical forceps to clamp the anterior lip, the probe to understand the depth of the uterine cavity and the direction of the uterine cavity, and cervical dilatation rod dilated to a larger than the diameter of the sheath of the hysteroscope half a number. 2. Anesthesia: hysteroscopy is generally taken by intravenous anesthesia, the need for preoperative fasting 6-8 hours, to be operated by a professional anesthesiologist, and monitor the subject’s vital signs changes. 3. Expansion of the uterus: connect the liquid expansion pump, adjust to the appropriate pressure, put the hysteroscope slowly into the uterine cavity, and adjust the liquid flow of the outlet to ensure that the intrauterine pressure reaches the required pressure. 4. Examination of the uterine cavity: after successful dilatation of the uterus can directly observe the whole uterine cavity, including the endometrial tissue, tubal openings, etc., and exit the mirror at the same time to observe the endocervical opening and cervical canal of the uterine cervix. Painless hysteroscopy is a commonly used minimally invasive gynecological examination method, which needs to be operated by professional physicians.