CDFI in color ultrasound is an abbreviation for color Doppler flow imaging, CDFI refers to the blood perfusion in a certain area during the color ultrasound examination, including both the blood supply to the organ itself and the blood flow within and around the abnormal mass, it is a part of the ultrasound examination that must be described. The direction of the blood flow and the magnitude of the velocity are identified and superimposed on the B-mode ultrasound sonogram, respectively. CDFI has the advantage of two-dimensional ultrasound structural images, but at the same time provides rich information on the hemodynamics of blood flow. CDFI has the advantage of two-dimensional ultrasound structural images, while providing a wealth of information on hemodynamics. At present, the description of blood flow information usually includes the presence or absence, amount, nature, shape and distribution direction, and velocity of blood flow, which has a wide range of clinical applications. The description of CDFI can provide a better understanding of the blood flow supply inside the organs and lesions, and provide more valuable reference information for clinical use.