In order to study the Reynolds number effect of the Strouhal number of bridge deck section, Reynolds number was changed by adjusting wind speed and pressure taps were set on the surface of model. Wind pressure time history was recorded at different Reynolds numbers. The pressure gradient 、pressure coefficient power spectrum and frequency of vortex shedding were also studied in the same range of Reynolds numbers . Reynolds number effect of Strouhal number was studied too. The investigation indicates that Reynolds number effect of bridge deck pressure gradient and the pressure coefficient power spectrum are considerable, and it is difficulty to identify vortex shedding by use of the frequency spectrum of pressure time-history record at high Reynolds number. Studies show it is clear that Reynolds number effect of Strouhal number exists in bridge deck section.