Three-dimensional gynecological ultrasound is a common auxiliary examination in gynecology, which mainly examines fetal development and whether it suffers from gynecological diseases. 3D ultrasound is three-dimensional dynamic, which can clearly display the three-dimensional shape of suspicious structures.1.Observation of fetal development: 3D ultrasound can determine whether the gestational sac is in the uterine cavity and whether the embryo is alive in early pregnancy, and can be used to determine the size of the fetus and check the echo of the placenta, amniotic fluid and umbilical cord in the middle and late pregnancy, and is also used for fetal heart structure examination and malformation examination, such as being able to observe It can also be used for fetal heart structure examination and malformation examination, such as observing the fetal head, limbs and the general structure of each organ for malformation; 2. It has a high value of auxiliary diagnosis for trophoblastic diseases. In addition, three-dimensional ultrasound diagnosis has outstanding superiority for many organs such as heart and large blood vessels in orientation observation, and for infertility and pelvic varicose veins can be observed through blood flow spectrum, while the activity of the tip of the probe can be borrowed to find the tender parts of pelvic organs and determine whether there are adhesions in the pelvis, etc.