The emergency contraceptive methods mentioned are the following methods: 1, within 72 hours after intercourse, you can take oral emergency contraceptive pills to prevent ovulation of the ovaries and abnormal thickening of the endometrium to prevent the fertilized egg from being laid, thus achieving the purpose of contraception. 2, you can use condoms, which are simple and convenient and can be taken over and used throughout the intercourse, as long as the condom is used and the condom is not broken. 3, you can use the IUD method of emergency contraception, if you do not take contraceptive measures after intercourse, you can use the intrauterine device to make the endometrium produce a sterile inflammatory response, to prevent the fertilized egg from being implanted, can also achieve the purpose of emergency contraception.