Contraception in addition to the IUD, there are three reliable methods: 1. Preferred contraceptive pill: The pill has been studied for 50 years, starting from the 1950s when the pill entered the Chinese market. There are 100 million people taking the pill worldwide and 165 million in China. From the beginning of the research of contraceptive pill, its progress is very fast and very good. The composition of the pill is mainly progestin and estrogen, and its mechanism of action is to inhibit ovulation, make changes in the endometrium to prevent the pregnant egg from being laid, and make changes in the mucus of the cervix to prevent sperm from penetrating; 2. skin burial: three threads are buried under the skin in the arm, and there exists a drug inside the thread that is the same as the pill, which releases a certain amount of drugs every day and can inhibit ovulation, and is generally valid for three years; 3. men mainly is tool contraception and vasectomy: vasectomy generally have more than two children do not want to reproduce, you can do ligation, if there is reversible, it is best to use tool contraception, men must ensure that every sexual life with tools, and tool condoms should be in line with the size of the reproductive organs, not too big, and not too small. If it does not fit, it can also cause contraceptive failure.