Long-span bridges are slender, light and flexible large-scale structures. Bridges in the cantilever state are found more susceptible to wind load compared to the bridges in the completed state. The wind-induced dynamic response numerical simulation of fluid-structure interaction of the long span bridge in cantilever state used ADINA is carried out in this paper. The wind-induced dynamic coefficients and the wind pressure distribution coefficients which can be used in the design are also calculated. These analysis provides the evidences for the incremental launching method.