Abstract: A parametric modeling and shape optimization method of a typical structural detail of warship is presented in this paper. First, a parametric model of a typical structural detail of warship is built by APDL. Then, th e shape parameters of the structural detail are defined as design variables and the stress concentration factor of the structural detail is defined as the objective function of the optimization design. By changing shap e parameters, a relatively small stress concentration factor is obtained. The results show that stress concentration can be effectively decreased using this method. This method can offer reference in the design and opt imization of typical structural details of warships.