A contraceptive ring is a metal ring or a medicated ring that is placed in the uterus to have a contraceptive effect. Both the metal ring and the medicated ring can be contraceptive because they are foreign bodies that cause chronic sterile inflammation of the uterine cavity and change the environment of the uterine cavity, making it unsuitable for embryo implantation. The medicated ring, also known as the Manned Ring, is a contraceptive ring containing high doses of levonorgestrel, which can last for 5 years with slow release of progesterone. Levonorgestrel can further reduce the local endometrial tolerance, affect the peristalsis of the fallopian tubes, change the permeability of the cervical mucus, prevent sperm from entering the uterine cavity, and inhibit local estrogen secretion in the vagina to achieve contraceptive effects. In addition, besides the contraceptive effect, the IUD also has a therapeutic effect on endometriosis, adenomyosis, adenomyoma, excessive menstruation and atypical hyperplasia of the endometrium, and the effect of amenorrhea can be achieved after 1 year of IUD application.