Systematic ultrasound is a systematic examination of the whole body of the fetus and is a broader concept that includes two-dimensional ultrasound, three-dimensional ultrasound, and four-dimensional ultrasound. Systematic ultrasound allows for the examination of all fetal systems, including the skull, face, cardiovascular system, digestive system, respiratory system, genitourinary system, and skeletal system. It can also be used to check the condition of the placenta, amniotic fluid and umbilical cord, which belongs to the macrosomia examination. While four-dimensional ultrasound belongs to one kind of system ultrasound, four-dimensional ultrasound examination is more clear, can three-dimensionally display the color of the fetus, the face, the development of various organs, and can even observe the state of the fetus in the mother’s body, and can be used to carry out early diagnosis of abnormal development of the fetus, cardiovascular malformations and so on through the results of the examination. Sometimes, some doctors will do the system ultrasound with two-dimensional black and white ultrasound, at this time, four-dimensional color ultrasound will appear more accurate than the system ultrasound, the examination is more specific. For example, abnormalities found by systematic ultrasound, such as cleft lip, spina bifida, as well as dysplasia of the brain, kidneys, heart, bones, etc., the diagnostic results are rather vague, and it may not be able to distinguish the type and degree of the disease in a specific way, and 4D ultrasound can be used to analyze dynamically, intuitively and comprehensively to understand the structure and function of the abnormal organs, and it can even record videos and take photographs, which can provide an accurate scientific basis for the early diagnosis of fetal malformations, and at the same time Provide direction for treatment.