According to the features of the stochastic wind field on long-span bridges and the Davenport coherence function, AR method is taken to simulate three-dimensional fluctuating wind field with Matlab. According to this method, a stochastic wind field of a bridge with a span of 800m is simulated and the simulated wind field is checked. The results show that the simulated values are well identical with the target values. This method can be used for simulation of th...