Abstract:How to obtain the atmospheric gravity wave parameters is one of the most important topics in atmospheric dynamic theory.By taking a thunder storm process on 6—8 August 2013 in northwest Shanxi province as an example in the paper and by using the commonly used second-order polynomial fitting, third-order polynomial fitting, fourth-order polynomial fitting and Bandpass filtering methods to obtain disturbance fields(denoted as SeOp, ThOp, FoOp and BpFp, respectively) from sounding data with high resolution, the paper conducted comparative analysis on the atmospheric gravity wave parameters obtained from those disturbance fields by using different methods.The results showed that different disturbance fields(second-order curve fitting, third-order curve fitting, fourth-order curve fitting and Bandpass filtering) exerted certain influence on the value and trend of the gravity wave parameters to different degrees.They exerted obvious effect on the value and trend of wave period, horizontal and vertical wavelength while posed little influence on the propagation direction, group velocity and phase velocity.By considering the dynamic characterisitcs of the thunder storm process during 6—8 Ausugst 2013, the gravity wave parameters obtained from SeOp and BpFp showed the highest reliability while the gravity wave parameter obtained from FoOp showed the lowest reliability.