Aerodynamic admittance describes the transfer behavior between wind spectra and buffeting forces spectra, which directly determines the precision of the buffeting response prediction. Due to the aerodynamic interference effect in the paralleled double bridges, the aerodynamic admittances of windward and leeward girder will be different from that of single girder. And the aerodynamic interference effect is related to the shapes of girders and distance between girders. Therefore, an practical engineering was taken as a background in this article, and the aerodynamic interference effect on the aerodynamic admittances was been researched by the method of sectional model force measurement in wind tunnel test. It was shown that there are some differences between the aerodynamic admittances of double girders and that of single girder, which is because of the aerodynamic interference effect; It is similar of the aerodynamic interference effect caused by the same girder, and vice versa; The aerodynamic interference caused by the girders with different distances affects the windward girder weekly, thus there was no obvious change law of the aerodynamic admittances of windward girder. With the increase of distance between windward and leeward girders, the aerodynamic interference effect on the aerodynamic admittances of leeward girder weakens gradually and can be ignored while the distance is larger enough.