To make the super long span bridge projects more feasible from a viewpoint of the wind resistant design, new significant progress in the aeroelastic numerical analysis as well as the detailed measurement of the full-dimensional unsteady aerodynamic force measurement must be required in the investigation of the bridge behavior against the wind action. In this paper a new method of the full dimensional aerodynamic force measurement is introduced for the three dimensional input of the response analysis as the Modal Decomposition and Reassemblage Method.