The vaginal wall at the top of the vagina and the annular cavity behind it between the cervix, the posterior vaginal fornix. Plugging the medication into the posterior fornix helps prevent the drug from being discharged from the vagina and the absorption of the vaginal mucosa, thus providing a therapeutic effect. The method can be roughly divided into three steps: 1. Before drug administration: clean the vulva, prepare the drug, wash your hands and put on finger gloves; 2. When administering the drug: lie on your back with your knees bent, use clean aids or hands to slowly push the drug in from the back of the vaginal opening until it meets resistance or touches the cervix, at which time the drug can be placed behind the cervix; sometimes the vagina is too deep to touch the cervix at all, so you can only try to After the drug is administered, remove the finger cover and wash your hands with warm water. In addition, the following things should be noted during the operation: 1. time of medication: vaginal medication is best done at night, so that the medication can be fully decomposed during sleep and act directly on the local area; 2. depth of medication: use your index or middle finger to push the medication into the vagina as far as possible to make the medication site accurate; 3. pay attention to cleanliness: during the medication period, keep the vulva as clean and dry as possible, wear cotton and breathable underwear, and change them daily; 4. Avoid sexual life: avoid sexual life during the drug treatment period to avoid affecting the efficacy of the drug or causing cross infection.