Effective contraceptive measures can be taken to avoid pregnancy, including birth control devices, birth control pills and condoms. 1. Contraceptive devices: the purpose of contraception can be achieved by placing the levonorgestrel device, etc. The main mechanism of its action is that the local tissues react to the foreign substance and affect the fertilization of the egg. Its main mechanism of action is the local tissue reaction to the foreign body and affect the fertilization of the egg. 2. Contraceptive pill contraception: hormonal contraception. Through the inhibition of ovulation, improve the cervical mucus, change the endometrium morphology and function and other mechanisms to achieve contraceptive purposes. Commonly used contraceptives include compound norethindrone tablets and so on. 3. Condom contraception: by preventing sperm from entering the vagina to achieve the purpose of contraception. It includes penile condom and vaginal condom. The specific contraceptive effect is also related to individual operation and other factors. It is recommended to consult a doctor in time for counseling and treatment.