Comparatively speaking, four-dimensional color ultrasound is more widely used than five-dimensional color ultrasound, and five-dimensional color ultrasound is more intuitive and clear than four-dimensional color ultrasound. Four-dimensional color ultrasound is a kind of ultrasound diagnostic method, mainly used for pregnancy detector examination, can be used in early, middle and late pregnancy, can dynamically observe the activity of the fetus, following and body surface, limbs, internal organs development, determination of various development indicators of the fetus, and estimation of fetal body weight, the location of the placenta position as well as the placenta function grading check. Five-dimensional color ultrasound is more intuitive and clearer than four-dimensional color ultrasound, and can record the baby’s every move in the womb as a video in real time, which can be displayed on a monitor for real-time viewing. Five-dimensional color ultrasound examination of the cranium, brain and heart is more accurate in the full range of malformations, such as cleft lip and palate, hydrocephalus, microcephaly, etc., and can rule out the existence of some serious congenital diseases of the fetus. Five-dimensional ultrasound is actually not very common at this stage, and four-dimensional ultrasound is more widespread. However, no examination is 100% accurate and the issue should be treated correctly.