The arm contraceptive ring, also known as subcutaneous implantation contraceptive method, is a new type of contraceptive method, which is to put a certain dose of progesterone, commonly used is levon-18 norethindrone implant, etrogestrel implant, into a silicon capsule tube, which is inserted in the inner side of the upper arm on the 7th day of menstruation, and the subcutaneous implantation of the silicon capsule releases into the blood circulation in a slow and constant manner, and acts as contraceptive after being placed for 24 hours. The advantages of subcutaneous implants are that they are estrogen-free, easy to use, and can be removed at any time to restore fertility. The main adverse effects are irregular small amount of vaginal bleeding or spotting bleeding, which usually diminishes and disappears after 3-6 months of implantation. A few women may experience amenorrhea, body fatness, breast swelling and pain, headache, blurred vision, mood changes, acne, and so on. Side effects manifest differently in each individual. If the side effects are obvious, you can go to the hospital to have it removed and switch to other contraceptive methods for contraception.