Yuqiao Reservoir is an important regulating-impounding reservoir of the diversion project to channel the Luanhc water to the city of Tianjing.An analysis of the flow field affected by the wind is the main way of studying the transportation-diffusion of pollutants and eutrophication of Yuqiao Reservoir.Based on the governing equations of fluid movement, and water surface shear stress under the action of the wind, a numerical simulation system of flow field has been developed by means of moving Alternating Directional Implicit Method.The simulation results are in very good agreement with the original data measured in the last 4 years.In addition, the flow field under the effects at stationary and unstationary situations of wind on 3 typical hydrographic years is predicated, a color picture of flow field given out, and its application disciissed.