Ultrasound B refers to B-mode ultrasound, while color ultrasound generally refers to color Doppler flow imaging. The most fundamental difference between B-ultrasound and color ultrasound is that color ultrasound can observe the speed and direction of blood flow and tissue movement in the human body, which can help diagnose the tissues and organs under examination in a more comprehensive manner. At present, the majority of ultrasound examinations are a combination of B-ultrasound and color ultrasound. B ultrasound is the basis of color ultrasound examination, and color ultrasound imaging needs to be obtained on the basis of two-dimensional images of B ultrasound, the principle of which is to use the echo of human tissue interface to display the anatomical structure of human tissues and organs and other information. And color ultrasound is mainly based on the Doppler principle to get the speed of the object’s movement and use pseudo-color coding technology to display the direction and speed of blood flow and other information, generally using red, blue and green colors to indicate the direction of blood flow and the glow of color to indicate the speed of blood flow. color ultrasound combined with B ultrasound can obtain more reliable diagnostic information. B ultrasound can display the size and shape of tissues and organs, and on the basis of B ultrasound can show the blood flow of some masses, tumors and other occupancies, which can provide more information for the analysis of tumors. It is also more meaningful for the detection and evaluation of blood perfusion in substantial organs, such as the evaluation of blood supply in transplanted kidneys. When there is inflammation, color ultrasound can generally detect a richer blood flow signal locally. In addition, the contribution of color ultrasound to cardiovascular aspects is great, allowing the understanding of the presence of stenosis and embolism in blood vessels and various evaluations of cardiac function. And it also plays an important role in the identification and evaluation of diseases in obstetrics and gynecology. So ultrasound and color ultrasound have differences, but they also have something in common.