Laser remote sensing detection technology has the advantages of fast information transmission, convenient operation, high precision and long-distance detection, and it can make up for the shortcomings of seismic exploration in complex terrain areas, such as difficult construction and slow seismic data acquisition. Utilization the characteristics of high sensitivity, high detection efficiency and off-axis detection of wavefront sensor, which used in seismic wave laser remote sensing detection to refinement the signal processing complexity caused by slow change of Michelson interference method in previous studies. By setting up the laser remote sensing detection system, the longitudinal waves in seismic waves are observed and analyzed, and the relationship between ground amplitude and wavefront sensor measurement spot is discussed. Experiments show that the system has better response to low frequency seismic waves, which solves the interference of natural frequency of the instrument itself. The characteristics of off-axis detection make the acquisition of reflection signals more convenient, which provides experimental reference for seismic wave laser remote sensing detection.