Abstract: An experimental device for target location is designed by using the Doppler effect of sound wave.The device is that the sound source is fixed，and the receiver does circular motion around the fixed axis.During the process of receiver motion，the received frequency is changed periodically.The position of the target point can be determined by the maximum frequency and the minimum frequency.The device is not only simple in structure，low in cost，but also has high positioning accuracy.

Key words: Doppler effect, target positioning, circular motion