Three-dimensional ultrasound is mainly to check whether there are malformations in the various organs and organs of the fetus, the best time to do three-dimensional ultrasound of the fetus in the 22-28 weeks of pregnancy. During the 22-28 weeks of pregnancy, the various organs of the fetus have basically developed, and the amniotic fluid volume is also relatively sufficient, and the activity of the fetus in the uterus is relatively large, so the three-dimensional ultrasound can clearly display the various parts of the fetal organs, understand the growth and development of the fetus, and check the fetus’s head, limbs, and the organs for anomalies. It is recommended that before the 3D ultrasound examination, the pregnant woman can eat something appropriate, because it takes a long time to do 3D ultrasound, to avoid hypoglycemia. Pregnant women during pregnancy should pay attention to do a good job of prenatal checkups, actively listen to the advice of professional doctors to do a good job of comprehensive care and health care, pay attention to more rest, at the same time should relax, to avoid nervousness, anxiety, there is any discomfort should be timely to the hospital, by the doctor to clarify the diagnosis and cooperate with the doctor to deal with the symptoms.