In order to investigate the mechanism of acoustic landmines detection,an acoustic-to-seismic coupling based experimental system was developed,and a curve-fitting method was adopted to study the measured complex signals.Acoustic-to-seismic coupling theory was briefly described,and the resonance mechanism of soil-mine system was analyzed.Then,a loudspeaker and a geophone array were employed to induce and receive the ground vibration respectively.Finally,an average algorithm was used to fit the curves of ground vibration velocity and to explain experimental phenomenon.Experimental results indicate that the ratio of ground vibration velocity on-to-off mine is greater than 1 in wide frequency range and up to 24 in peak frequency.It proves that landmines can induce the distinct changes of ground vibration,and proposed experimental system and curve-fitting method are applicable for further study of acoustic landmines detection signals.