Ultrasound has a wide role in medicine and can be used for the examination of many organ tissues, such as liver, gallbladder, pancreas, spleen, uterus, ovaries, fallopian tubes, intestines, etc. Ultrasound is a form of ultrasound through brightness pattern to diagnose diseases, which does not cause damage to the human body during examination and is an indispensable instrument in clinical examination. In obstetrics and gynecology B ultrasound can be used to check the soft birth canal, fetal development, such as biparietal diameter, femoral length, amniotic volume, placental maturity, etc. It can be used to diagnose gynecological diseases such as ovarian cysts, uterine fibroids, ectopic pregnancy, and provide the basis for clinical treatment. Gynecological ultrasound examination is divided into abdominal ultrasound and vaginal ultrasound. When doing abdominal ultrasound examination, it is necessary to hold urine to make the bladder full, which is good for seeing the examined organs and tissues clearly. Vaginal ultrasound does not require holding urine and has higher clarity. It is best not to do vaginal ultrasound during menstruation.