The specification and the layout of routes are different for different types of ships and different posi-tions of the same type of ships.The layout of routes is the critical element for crew escape and ship overhaul and main-tenance.In addition,it is the most modified subject to modification during fitting-out.Based on the case of a ship,this paper analyzed the layout scheme of the interior and exterior routes and summarized the relevant specification re-quirements for reference.