Abstract: In this paper, through making an analogy of the principle of ultrasonic detection and the multipath effect in the wireless communication theory, we propose a method to realize the ultrasonic testing, which is based on single carrier frequency domain channel estimation algorithm. Zadoff-Chu sequence signal which is added a cycle prefix is used to estimate the target distance. At the same time, the distance sidelobe which is caused by pulse compression can be eliminated. The simulation results show that this method can detect the signal of well under a low SNR and solve the problem of the distance sidelobe of pulse compression.