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Vertical stabilizer plates have been found to be an effective aerodynamic measure to improvethe aerodynamic stability of bridges either with an open cross section or with a streamlined box crossI-shaped section and a closed box section as examples, the mechanism of vertical stabilizer plates forimproving aerodynamic stability are investigated by using numerical simulation based on Random VortexMethod. It is found that vertical stabilizer plates can increase the amplitude of the heaving motion, anddecrease that of the rotational motion of the bridge decks.