The main subjects of this paper are to research the co-curing single-lap stitiched composites joint using experimental method and numerical analysis. In the experimental part, we firstly research the displacement measurement precision of digital image correlation technique (DIC), and then apply DIC on the deformation measurements in micro areas of the single-lap stitched composites joint. In the numerical simulation part, FEM is used to research the effect of stitch line and resin fillet on the stress...