Passenger ships are generally used to carry passengers' vehicles and small quantities of goods. The basic characteristics of passenger ships are as follows: the superstructure is developed and used for arranging passenger compartments; The safety requirements for anti-sinking, fire prevention and lifesaving are relatively strict; The comfort requirements for roll reduction, shock absorption and sound insulation are high; Fast speed and large power reserve. The vast majority of passenger ships are scheduled to sail, which is also called liner.

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.