External contraceptives for women include vaginal insertion, intrauterine placement of slow-releasing drugs, subcutaneous implantation, etc. The usage is as follows. 1. Vaginal insertion: women can use vaginal membranes and other external contraceptives for vaginal insertion, can be placed in the cervical opening of the female vagina, can play a role in preventing sperm from entering the uterine cavity, and vaginal membranes may release drugs to kill sperm, so as to achieve the effect of contraception. 2. slow release of drugs placed in the uterine cavity of the birth control device: can be placed in the female uterine cavity of the Manele birth control device, this kind of birth control device has a slow drug release system, in the uterine cavity, can be a continuous release of levonorgestrel, can play a role in contraception. 3. Subcutaneous implantation: Subcutaneous implantation of silicone rods containing sex hormones, silicone pumps can continue to release sex hormone drugs into the blood circulation, so as to achieve contraceptive effect. Women need to be guided by professional obstetricians and gynecologists for the application of external contraceptives.