Abstract: Based on the physical analysis of the dynamic and thermodynamic effects of the Tibetan Plateau, the influence of the height, orographic slope and diabatic heating of the Tibetan Plateau on the low-frequency fluctuation at the middle and high latitudes is examined. The results indicate that the height, proper orographic slope and diabatic heating of the Tibetan Plateau can facilitate the generation of the low-frequency fluctuation and affect the stability of the low-frequency Rossby wave.