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I. Introduction he structural design of aircraft wings can benefit greatly from the development of multidisciplinary design optimization (MDO). Minimizing the wing weight is often one of the prime important objectives, while various constraints in multiple disciplines, such as structure, aerodynamics and aeroelasticity, should be imposed on the aircraft. The study of MDO originates in structural optimization, which can be traced back to Schmit’s innovative paper published in 1960 [1]. In his work [1-3], a numerical optimization technique was coupled with a finite element analysis to search for the optimum design in an efficient way. Motivated by the success of structural optimization, the MDO approach has been widely applied in the aircraft structural design since the 1970s thanks to the improvement of the computer technology. Haftka [4-6], Sobieszczanski-Sobieski [7] and their collaborators studied the optimization of …