Abstract: This paper present s design studies of aeroelastic optimization of a high-aspect-ratio composite wingusing a genetic/ sensitivity-based hybrid algorithm. The design studies were carried out under the conditions ofmeeting multiple const raint s including strength, displacement, divergence speed and flutter speed. In the course ofoptimization, the thickness of plies of wing component s was considered as design variables, while the minimum ofthe st ructural weight as an objective function. The present work has made it clear that the problems with thebending deformation should be given serious consideration in the st ructural design of high-aspect-ratio compositewings because it has great effect s on the final optimized weight . It is also obvious that the wing st ructures formed onthe basis of st ress design criteria could hardly fulfill the requirement s on the bending deformation. A satisfactoryresult could be obtained at a reasonable cost of computational work by means of the genetic/ sensitivity-based hybridalgorithm in the aeroelastic optimization design of high-aspect-ratio composite wings.