The time for a woman to have an IUD is from the third day to the seventh day of her menstrual cycle. Before the procedure, the vaginal discharge should be checked. If there is vaginal inflammation in the vaginal discharge test, the procedure should be performed only after the vaginal inflammation is cured. If the vaginal inflammation is cured, further blood tests such as routine blood count, immune panel and coagulation function are needed to understand the patient’s physical status and whether there are any contraindications to the procedure. If there is no contraindication to the procedure, the patient can undergo the IUI. After the IUD, you should pay attention to rest, avoid strenuous exercise and prohibit sexual life. After the IUD, you should have a normal period and return to the hospital for gynecological ultrasound to understand the position of the intrauterine ring.