%0 Journal Article %T Hygro %A D Cui %A D K Li %A S M Zhou %J Advanced Composites Letters %@ 0963-6935 %D 2018 %R 10.1177/096369351802700303 %X The tensile strength and compressive strength are indispensable indexes during the design process of composite laminates. For hygro-thermally curvature-stable extension-twist coupled laminates, the improved Differential Evolution Algorithm combined with penalty function is adopted to solve the nonlinear strong constraint of free-layer laminates. The synchronous optimization of multiple targets is achieved, which includes extension-twist coupled effect, tensile strength, compressive strength and buckling strength. Results are presented for free-layer graphite/epoxy composites laminates that consist of 1¨C18 plies. Finally the hygro-thermal effect, extension-twist coupled effect and buckling strength are simulated and verified %U https://journals.sagepub.com/doi/full/10.1177/096369351802700303