In order to accurately simulate 3-D wind field of wind turbines, taking the NH1500 wind turbine researched by Nanjing University of Aeronautics and Astronautics as an example, the exponential model for changing height, the undercurrent model for tower shadow effect and the eddy viscosity model for wake effect from upstream wind turbine are used to modify the steady wind. Then based on the modified Von Karman wind speed spectrum model, the incoming wind speed time history is simulated by the harmony superposition method. Finally the 3-D wind field considering the rotational effect and blade-tower interaction effect is obtained with the modified blade element momentum theory. The external interference factors and itself characteristics are fully considered to improve the accuracy of wind field simulation. The results show that the proposed algorithm is of high accuracy, which can be used to simulate 3-D wind field of wind turbines under given wind condition.