Abstract: Curvilinear fiber format is one of the effective ways to improve the mechanical properties of composite components.The laying trajectories of open-hole composite laminates were investigated. B-spline interpolation was used to obtain the laying trajectory of open-hole composite laminates with the maximum principal stress. The variable stiffness open-hole composite laminate model was established by discrete grid method.The tensile failure numerical simulation and damage failure analysis were carried out by Tsai-Wu damage failure criterion and constant stiffness degradation criterion. Two sets of constant stiffness and variable stiffness open-hole composite laminates experimental specimens were placed, respectively. A tensile strength experiment was performed.The results show that the numerical simulation accurately captures the data from experiment. The tensile strength of variable stiffness open-hole composite laminates, compared with constant stiffness open-hole composite laminates, increases by 26.92%, and the damage evolution processes of both are significantly different.