Abstract: Buffeting responses of structures are excited by buffeting forces, which are determined by the aerodynamic admittance function (AAF) of structures and power spectrumdensity of turbulence., the Sear’ s function, which is based on the strip assumption, fails to accountforthe coherence ofthe turbulence along the span. It is shown by the analysis that 3-dimensional AAF (3DAAF) is affected by the dimensions of the structure, the characteristic of the turbulent field and the reduced frequencies. The taut-strip test also shows that 3DAFF accords betterwith the facts met in civil engineering.