The structural dynamic model of wind turbine is investigated by using Assumed mode method. Veer turbulence model is created for generating time history of three-dimensional of wind speed. Along with the wind field model and Modified BEM model, the wind turbine aero-elastic systematic dynamic model was constructed in Fortran. The model can describe the dynamics of wind turbine more correctly than subsystem model. A 2MW wind turbine model has been calculated and the results are compared with GH bladed ones. The results show that the method has excellent capacity in simulating the characteristic Based on the theory of presumed mode method, the study can lay a foundation to a set of dynamic model for wind turbine analysis.