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Researches on wind over expansive water surface have been done mostly by statistic methods which have disadvantages sometimes. The wind velocity at Sutonghighway bridge was simulated using the mesoscale model WRF in this paper. The initial static data used by the model was modified to improve the results of simulation to wind velocity at Sutton highway bridge. Two examples were chosen to carry out sensitivity experiments on terrain and land-water distribution using the modified model. For the sensitivity experiments on terrain, the terrain height of the simulation domain was modified to 0 to find the effect of the terrain height, and the simulation domain was totally changed into water to find the effect of the land-water distribution. Finally, some conclusions were found as follows:After modifying the initial static data such as land use,terrain height and vegetation greenness etc, the results of the simulation was improved by a certain extent. While the weather systems were simulated well and truly by the model,the maximum wind velocity at Sutong highway bridge could also be simulated accurately. The other way round, the simulation results of the maximum wind velocity at the bridge were obviously smaller than the real values if the model was not able to accurately simulate the precipitation systems. The terrain height has little effect on the results of the wind velocity simulation here. It is the water-land distribution that plays a crucial role to form the unique wind velocity distribution in this region.