Abstract: Aiming at the actual requirement of ship maintainability design and the shortcoming of veracity and intuition of traditional maintainability analysis techniques, a ship maintainability design analysis sys-tem is proposed in this paper based on digital prototyping through secondary development on Jack. The de-velopment is accomplished under instruction of the system structure, which includes interface layer, appli-cation layer, object layer, and technical support layer, and through the key technology of virtual prototyping modeling, virtual human modeling and simulation, parameterization maintenance operation modeling and simulation, the maintainability analysis based actual maintenance troubles is conducted. Finally, a certain maintenance task of replacing the filter element of one type of water quality after-treatment equipment in cabins is selected, where the maintainability design analysis is performed, and the feasibility and effective-ness of the system are verified.