Abstract: In this paper the acoustic intensity probe CM-202 and a microphone pair are used, and a bracing frame is designed for the probe CM-202, so that it can be turn to three mutually perpendicular axes of spatial Cartesian coordinate system and their geometric centers are the same, in this way, three components of acoustic intensity vector of one point in stationary sound field and the bearing of sound source can be determined. The bearing experiment of sound source is done with the set of experiment device in semianechoic room, the relation between bearing precision and all kinds of error factor is discussed.