Abstract: The actual working wind filed was established by using the self-designed program of Davenport wind spectrum, and the displacement and stress response of the wind turbine blade under offshore random wind speeds was numerically simulated and analyzed on the basis of 3D blade solid model built by UG software. Results show that the maximum flapping amplitude and the maximum Mises stress of the blade both increase with the increase of the average wind speed; the growth trend of the biggest flapping amplitude for the whole blade is nonlinear along the wingspan and the tip amplitude reaches the maximum; and the max Mises stress appears near the leading edge in the middle part of the blade, and the root and tip parts are relatively small.