Placement of IUD should be done within 3-7 days after menstruation, and do not have intercourse after menstruation. Because at this time, the uterine lining is just in the early stage of hyperplasia, the lining is relatively thin, it is not easy for vaginal bleeding to occur, and the position of the IUD is more secure at this time. The IUD should be placed at the bottom of the uterus, at a distance of 1.2-2.0cm from the uterine fundus, if it exceeds 2.0cm, there is a possibility that the IUD will move down. After placing the IUD, it is necessary to rest for 3 days, prohibit sexual intercourse and bath for half a month, avoid heavy labor for one week, and do a good job of following up after the IUD, and do ultrasonography to check the position of the IUD at 1 month, 3 months, 6 months and 12 months, and then do ultrasonography once a year.