Four-dimensional ultrasound showed bilateral lateral ventricle width of about 1.1cm should be closely observed, 4-6 weeks to do ultrasound examination, pay attention to fetal movement, regular obstetric examination. The normal value of bilateral lateral ventricle width is 7.6±0.6mm, and the upper limit of normal is 10mm. 4D color ultrasound shows that bilateral lateral ventricle width is about 1.1cm, which is slightly higher than the normal value, and it may be caused by excessive cerebrospinal fluid, and ventricular circulation in the later stage may be absorbed on its own, and generally does not need special treatment. 4-6 weeks to review the color ultrasound should be paid attention to the good fetal movement and regular obstetric examination. If 4 to 6 weeks review ultrasound continued to widen in 15mm and above, may be hydrocephalus, if accompanied by brain structure or chromosomal abnormalities, it is recommended to terminate the pregnancy. Four-dimensional ultrasound shows bilateral lateral ventricle width of about 1.1cm pregnant women, do not be nervous, relax your mind, regular checkups.