The static coefficients of typical bridge section under the wind-rain coupling effect were studied using the numerical simulation by CFD（Computational Fluid Dynamics）.Based on secondary development for the computational fluid dynamics software by applying source term，DPM(Discrete Phase Model) model combined with a UDF(User Defined Function) function method was used to study the wind-rain coupling effect on static coefficients of bridge.Meanwhile，Euler method was used to simulate the air phase and Lagrangian method was adopted to simulate the rain with discrete phase model.Impact load on the bridge section was obtained by the impulse theorem.The accuracy of the method was verified by comparing with the existing results in the corresponding literature.The wind-rain coupling effect on the static coefficients of typical bridge section is then studied，and the mechanism research of wind-rain coupling on typical bridge section was realized，which provides a theoretical method for the study of the wind-rain coupling load on the bridge.