Abstract: The principles and methods are more deeply discussed and studied for drawing and processing ultrasonic Doppler blood flow information with synthetical wave beams formed by a phase array of ultrasonic transducers. In accordance with requirements of process of acquired blood flow information, it is laid emphasis on introducing special methods to carry out real time scroll frequency spectrum and power spectrum analysis of Doppler blood flow. By displaying synchronously in combination with the result of spectrum, analysis and B mode 2-dimension images and M mode cardiograms, it will be obtained information about dynamic distribution of the heart and blood vessels. the courses, directions and properties of the blood flow, the blood volume, and the speed of blood flow. thus it can supply important basis for diagnosing diseases of the valves of heart and blood vessel, it raises the ways to be detected diseases of the heart by ultrasound to the level of hemodynamics.