Abstract:The borehole strainmeter can be calibrated by seismometer through joint observation of teleseismic surface waves. The basic idea is to calibrate the shear strain sensitivity coefficient B with Love waveform first and then calibrate the surface strain sensitivity coefficient A with Rayleigh waveform. However, we find that the B and A calibrations of different teleseismic surface waves are quite different. Therefore, validity is introduced to indicate the degree to which the surface waves can be accurately calibrated to B and A values, and the calibration with the highest validity is used as the final calibration result. This method is applied to calibrate the borehole strainmeter of Renhe seismic station, and the results are as follows: A=0.36, with a validity of -0.71; B=0.73, with a validity of -0.92.