Vaginal ultrasound is a more effective and safer method of examining the female internal genitalia, but it also has certain hazards, such as the following circumstances are not recommended for vaginal ultrasound: 1, for women who do not have sex, vaginal ultrasound is not recommended to prevent the hymen from breaking. 2, for pregnant women, vaginal ultrasound is not recommended in the early stages of pregnancy to prevent vaginal ultrasound, the probe stimulates the cervix and induces contractions, especially for pregnant women with placenta previa, to prevent the stimulation of the probe to induce contractions. Ultrasound probe stimulation of the cervix, inducing contractions, especially for placenta praevia pregnancy is not recommended for vaginal ultrasound, to prevent the stimulation of the probe induced contractions, the occurrence of placental abruption, vaginal bleeding and infection. 3, for a large amount of vaginal bleeding, vaginal ultrasound is not recommended for women, because a large amount of vaginal bleeding patient’s uterine opening tends to be open, and easy to secondary uterine infection, causing pelvic inflammation, uterine infection, and the uterine cavity. infection, causing pelvic inflammatory disease, endometritis, etc. Vaginal ultrasound is not recommended for these patients. Vaginal ultrasound examination is often coated with a layer of coupling agent on the vaginal probe, the outside of the set of sterilized condoms, normal women for gynecological ultrasound examination is relatively safe, has been widely used in clinical practice.