The IUD generally refers to the female sterilization ring, which is placed in the uterus through the vagina and cervix, and its specific steps are as follows. 1. Preoperative preparation: the birth control ring needs to be placed in the uterine cavity of the hospital within 3-7 days after the woman’s menstrual period is clean. The 3-7 days after menstruation is absolutely no coitus. 2. Pre-operative examination: Arrange the corresponding examination before placing the birth control ring. For example, gynecological examination, infectious disease examination, etc., to make sure that there are no other contraindications before placing the birth control ring. 3. To be operated: no contraindications after the completion of the examination, into the operating room doctor will be vulva, vagina, cervix routine disinfection, and then according to the gynecological examination to understand the location and size of the uterus, and then select the appropriate type of uterus to place the IUD in the body. Note that after the placement of the IUD, the position of the IUD needs to be rechecked after the next normal menstrual period; if there is any discomfort after the operation, consult a doctor promptly to avoid delaying the condition.