Experiment studies are carried out on the stitching reinforcement of composite laminates containing a circular hole. The tensile strength and stiffness are measured, and their dependence on stitching parameters such as stitching needle distance, row spacing, edge distance and stitching type (i.e. single stitching or double stitching) are analyzed. The strain distribution is investigated experimentally for different stitching parameters, external load and edge location of the hole. It is shown that the results of stitching reinforcement are quite different for composite laminates with a circular hole, which could provide proper stitching parameters for designers. The analysis for different failure samples are made. Reinforced by stitching, the failure section is mainly perpendicular to loading direction. It can be seen that the capacity of load bearing rises when the composite components are reinforced by stitching the hole.