Three-dimensional color ultrasound surface imaging is used for obstetric examination, not only to observe the process of fetal growth, but also to check the changes of the placenta, amniotic fluid and umbilical cord, and more importantly, as the main means of diagnosing fetal malformations. Due to the large contrast between the tissue structure and the gray scale of the liquid, it can clearly display the three-dimensional morphology, surface characteristics, and spatial positional relationship of the suspicious structure, providing a three-dimensional image of the fetus in the uterus. Three-dimensional reconstruction includes surface imaging, transparent imaging and multiplanar imaging modes. Its advantages are: 1, increase the coronal section image on the basis of retaining the two-dimensional imaging. 2, three-dimensional positioning, axial position adjustment, ABC three axial plane can be adjusted until the display of the best image. 3, three-dimensional imaging, dynamic intuitive; real-time dynamic observation of the fetal head, body surface and visceral activities, the image is clear, accurate and reliable. 4.Cutting function, can retain the focus of the image; cut off the useless part, the suspicious part of the three-dimensional reconstruction display. 5.Rotation function, multi-faceted observation; with front and rear, left and right, up and down 360 ° rotation function, the image of different aspects of a comprehensive observation. 6.It can take beautiful photos of the fetus, record the change of expression and burn a CD-ROM as information to save and keep as a permanent memory. 7.It can show the three-dimensional relationship and adjacency of lesions at different levels. Three-dimensional color ultrasound in obstetrics for clinical ultrasound diagnosis provides a wealth of image information, the fetus in the amniotic cavity is surrounded by liquid is a three-dimensional ultrasound good imaging conditions, the image is three-dimensional, image intuitive, can be adjusted at any angle, through the rotation of the three cuts can be observed to the suspicious structure of the fetus structure of the deformities can be seen at a glance, greatly improving the quality of diagnosis and treatment and reducing the misdiagnosis or omission of the diagnosis.