The superstructure of passenger ships with multiple decks is used for arranging passenger compartments; It has relatively complete restaurants and health and entertainment facilities; It has good anti-sinking property, which is generally "non-sinking system of second cabin" or "non-sinking system of third cabin"; Equipped with sufficient life-saving and fire-fighting facilities; Fast speed and large power reserve.

Passenger ships refer to ships specially used for transporting passengers and their luggage and mail. Those carrying more than 12 passengers shall be regarded as passenger ships. With the development of long-distance air transport, passenger ships have gradually turned to short-distance transport and tourism services.