Actually, we have adopted Geological sketch working face, HSP acoustic reflection method and ground penetrating radar and other methods to prediction and detection, security policy-making for tunnel construction to provide a strong basis for the geological.

As one of the methods,the sound wave reflection method expatiates the application value and significance of HSP sound wave test in excavation of tunnels from various aspects such as sound wave reflection principle,working conditions and practical application in projects,etc.

This paper used vertical acoustic reflection method to detect the quality of Liaofang Reservoir\'s dike cutoff wall,and processed original data in instantaneous spectral method.