Fetal lateral ventricle widening suggests that the fetus may have hydrocephalus, ventricular septal defect is the most common congenital heart disease. Fetal lateral ventricle widening, normal width <10mm, if within the range, pay attention to review, may slowly late self-absorption. If the width of the lateral ventricle is increasing, it means that the fetus may have hydrocephalus. This is usually and fetal gene chromosome abnormality has a great relationship. Ventricular septal defect is a developmental disorder of the interventricular septum in the fetal period, forming a left-to-right shunt. It may be hereditary, or it may be caused by the mother’s medication, frequent exposure to radiation, and other factors. In this case, it is necessary to pay attention to the review, and further follow the doctor’s instructions, do amniocentesis and other tests, and analyze and judge with the results of the puncture. If necessary, the pregnancy should be terminated. If there are any uncomfortable symptoms, go to the obstetrics and gynecology department of the hospital for relevant examinations.