Abstract: The gravity wave is an important energy source of mesosphere.The airglow measurements provide a good method to study gravity wave characteristics in the mesosphere.In this paper,a full photochemical-dynamical model for analyzing the effect of gravity waves on the OH airglow was established by adopting recent excitation mechanism for total OH airglow.The result shows that the effects of the uncertainty of rate constants in the chemical reaction is not larger than 10%,but the effects of quenching must be considered.The amplitude and phase angle of Krassovsky ratio 77 depend on wave period,the value of |η| is 2.1 to 10.3,which shows that the relative variation of OH airglow intensity is larger than that of atmospheric temperature.And the variation of the OH brightness is led by the temperature fluctuation of gravity wave.The theoretic model is consistent with the observations,especially for short period wave.