Abstract: Based on the continuous gravity observation data of Wujiahe seismic station in Inner Mongolia, the waveform correlation between PET relative gravimeter and JCZ-1 very broadband seismometer and the physical characteristics of coseismic deformation are analyzed using the high sampling rate of PET gravimeter. By simulating and analyzing the correlation between the coseismic P-wave, S-wave and surface wave with epicentral distance and magnitude of six strong earthquakes with M≥7 occurred around Bayankala block recorded by PET relative gravimeter at Wujiahe seismic station, the general magnitude model, in-situ stress wave model and S-wave P-wave amplitude ratio model are obtained. By calculating the error and correlation coefficient R value between the theoretical magnitude and the actual magnitude of the three models, the standard error between the theoretical magnitude and the measured magnitude is 0.04, and the R value is 0.99, which verifies the reliability of the model. The error and R value of theoretical magnitude and actual magnitude are compared and analyzed to reveal the physical mechanism of geodynamic characteristics contained in coseismic deformation waveform.