Abstract: The seismic wave travels at different velocities in different media,therefore the seismic wave can be used to detect effects of grouting engineering.The paper presents a case study of its application in detecting effects of grouting in Da-ping rock pile.By comparing difference in compression modulus before and after grouting and detection of seismic waves,the authors concluded that the seismic wave method is a good method for detecting effects of grouting in highway slopes.