Since the introduction of diagnostic ultrasound imaging technology, ultrasound has become one of the most important tools for clinical diagnosis in hospital internal medicine. It realizes real-time two-dimensional imaging of human internal organs, which enables more accurate diagnosis and timely treatment of patients’ internal diseases. However, because of the relatively small amount of information and low quality of the image displayed by ultrasound, it has certain limitations, and thus the image diagnosis of some difficult diseases is often blurred, which directly affects the diagnosis effect. With the progress and rapid development of science and technology, the color ultrasound Doppler flow imaging system was developed in the early 80s. In the middle and late 80s, our scientists tracked the world’s advanced technology and finally made a major breakthrough in the research of color ultrasound after years of tireless efforts and diligent research. The first domestic color Doppler flow imaging system designed and developed by Shenzhen Anke Company broke the monopoly of only a few countries in this field and made China enter the leading ranks of medical color ultrasound diagnostic systems in the world. The color ultrasound Doppler flow imaging system, referred to as color ultrasound, has a complex structure, mainly consisting of a probe, ultrasound transmitting circuit, receiving circuit, signal processing display part and recording part, etc. Its working principle is designed according to the Doppler principle. So, what is the Doppler principle? When there is a relative motion between the transmitting and receiving frequencies, the frequency received by the receiving side will change due to the effect of the motion. In diagnosis, the doctor uses a probe to transmit ultrasound waves, and the blood cells in the blood vessels reflect the ultrasound echoes. Since the blood cells are in motion, the frequency of the reflected ultrasound echoes will change, and thanks to Doppler technology, the physician can detect the direction and speed of blood flow based on this change, providing a realistic understanding of the state of blood flow in the heart and blood vessels in real time and rich hemodynamic information. Thus, a more satisfactory diagnosis can be made for the subject, which makes the perfect combination of ultrasound technology and Doppler technology and solves many problems that cannot be accomplished by black and white ultrasound. Compared with the ordinary ultrasound system, the color Doppler flow imaging system can not only obtain blood flow motion images, but also the image quality has greatly improved. Clearer and higher resolution images of organs allow for non-invasive observation of the internal structure, morphology and motion of the heart and large blood vessels. More pathological states of organs can be detected by various specific probes, and the measurement and analysis functions are more complete. Some difficult diseases basically cannot escape its “golden eye”, which makes color ultrasound a powerful assistant for doctors. The core of the color ultrasound Doppler flow imaging system is that it can reflect the blood flow dynamics in real time, so it has a wide range of applications. In addition to ordinary two-dimensional imaging, it is mainly used for the detection of cardiac blood flow, which is important for the diagnosis of heart, liver, cardiovascular, kidney and other substantive organs and obstetrics and gynecology diseases. In addition, it can also be used for surgery and interventional treatment. The widespread use of color ultrasound has opened up new horizons in diagnostic imaging technology and brought hope to millions of patients. We believe that color ultrasound Doppler blood flow ultrasound diagnosis technology will play a greater role in maintaining human health.