The IUD should be removed within 3-7 days after menstruation because the vaginal environment is best at this time and the endometrium is in its thinnest state, so the damage to the endometrium during the IUD removal is smaller, the bleeding after the procedure is less and the endometrium is repaired more quickly. The following cases can be removed at any time: first, abnormal uterine bleeding, need to do segmental scraping plus pathology, after a clear diagnosis can be added to the segmental scraping at the same time to remove the ring. Secondly, when MRI and CT examination is to be performed for pelvic occupancy, the ring can be removed at any time because it affects the examination. Third, the ring can be removed at any time for menopausal and perimenopausal women. Fourthly, if the ring is displaced and causes a lot of vaginal bleeding, the ring should be removed to reduce the amount of vaginal bleeding.