To cope with the impact of gust loads on flying-wing aircraft, this paper presented a framework containing model and controller. Firstly, a coupling model basing on unsteady vortex lattice method and geometrically exact beam model was constructed. Secondly, linearize each model individually and assemble them in tight-coupling way. And reduce the linear model’s order through Krylov subspace method. Thirdly, a LQR controller and corresponding Luenberger observer is designed. Using a clamped Pazy wing model as the simulation object for verifying the performance, both open-loop and closed-loop simulation with gust is taken in linear and nonlinear model. Finally, the result showed a significant alleviation in displacement of wing-tip, which showed that controller designed performances well in handling gust load alleviation.