Intrauterine device placement time: 1, 3-7 days after menstruation without sexual intercourse 2, immediately after abortion 3, 42 days after childbirth, the malaria has been clean, perineal wounds healing, uterus back to normal 4, six months after cesarean section placed 5, progestogen-containing birth control ring in the third day of menstruation placed 6, spontaneous abortion after the menstruation placed, drug abortion after two normal menstruation placed 7, lactation Placement should first exclude early pregnancy 8, placed within 5 days after sexual intercourse as one of the emergency contraceptive methods Post-operative precautions: 1, rest for 3 days after surgery, 1 week avoid heavy physical labor, 2 weeks avoid sexual intercourse and tub bath, keep the vulva clean. 2, the first year after surgery 1, 3, 6, 12 months for follow-up visits, after the annual follow-up visits until discontinued, special circumstances at any time; follow-up visits to understand the IUD in the uterine cavity, the discovery of problems, timely treatment, to ensure the effectiveness of the IUD contraception.