Large debris flow disasters had happened twice in Zoumaling valley of Mianzhu city of Sichuan province in 2009 and 2010, and the direct economic loss exceeded 30 million yuan. The numerical simulation fields of flow velocity, pressure and mud depth of the Zoumaling debris flow had been computed in this paper, by using finite volume method software CFX based on the CFD. The Bingham fluid was chosen as the constitutive model of this debris flow. The debris flow geometry model was 3D model. The initial conditions, boundary conditions, control equations and parameters were determined and adjusted by the actual conditions and analyses. The flow field data obtained from numerical simulation were substituted into finite element software ANSYS. Then, all these results such as the force of debris flow to dams, the stress and strain of the dams under the debris flow field and safety coefficient were obtained by the calculations of fluid-solid coupling action between the flow and dams which can apply some reference for further research about debris flow.%针对绵竹市走马岭沟特大泥石流灾害及防治工程，采用基于有限体积法的CFD软件CFX，对泥石流流体采用宾汉体模型，建立三维几何模型，确定泥石流的初始条件和边界条件，建立控制方程，采用合理的控制参数等，模拟计算了走马岭泥石流的速度、压力、泥深等流场数据。然后将数值计算得出的流场数据导入有限元软件ANSYS中进行流固耦合计算，从而得出泥石流的流场对拦砂坝的作用力，以及拦砂坝在泥石流作用下的应力应变、安全系数等情况，为泥石流的相关研究工作提供一些参考。
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