Abstract: The present invention provides an intravascular ultrasound probing device using Doppler effect. The intravascular ultrasound probing device comprises a first tube, a first ultrasound probe head positioned in the first tube, a second ultrasound probe head positioned in the first tube and an separating member positioned between the first ultrasound probe head and the second ultrasound probe head. Preferably, the first ultrasound probe head and the second ultrasound probe head are made of lead zirconate titanate (PZT), and can generate an ultrasound with a frequency between 1 MHz and 100 MHz. The first ultrasound probe head can measure the flow of the blood in a vessel, and the second ultrasound probe head can capture the image of the wall of the vessel. The separating member is preferably made of polymer for absorbing undesired reflection wave.