Detailed information of the velocity and pressure field of the blood flow is essential to establish an advanced diagnosis and treatment of serious circulatory diseases. Commonly used medical measurement equipments does not provide complete information of blood flow in real-time. In this report, we develop a new blood flow measurement system applying Ultrasonic- Measurement-Integrated (UMI) simulation, that integrates ultrasonography and numerical simulation. The system consists of ultrasonic diagnostic imaging equipment, a graphics workstation, and a calculation server. Computer programs for measurement data acquisition, flow simulation, and visualization are synchronized using socket communication scheme. By considering blood flow velocity measured, the system adjusted the phase of a flow rate waveform automatically to match the cycle of pulsation in real diagnostic images.