In　this　paper,　the　lines　design　of　an　underwater　vehicle　is　investigated.　Optimization　design　is　used　to　obtain　the　optimal　lines.　The　underwater　vehicle＇s　hydrodynamic　performances　and　energy　consumption　are　involved　in　the　framework　of　optimization.　Specifically,　the　resistance　and　maneuverability　of　an　underwater　vehicle　are　concerned　in　the　hydrodynamic　performances.　The　energy　consumption　of　the　underwater　vehicle　concerns　the　efficient　power.　To　weight　the　disciplines　in　the　overall　optimization　objective,　analytic　hierarchy　process　(AHP)　is　used.　To　replace　the　numerical　simulation　model　in　discipline　analysis,　an　approximate　model　is　established.　SUBOFF　model　is　optimized　by　using　the　proposed　method.　Optimization　results　reveal　the　effectiveness　of　proposed　method.　©　2024　IEEE.