Stealth performance is an important combat skill indicator for contemporary ships, thus affecting the vitality of a ship directly. Infrared stealth is one of the main components of ship stealth and is one of the key points of stealth design of advanced warships in various countries. In order to study how the infrared stealth performance of a ship may be improved, its infrared point source characteristics for the 3–5 .m band and its infrared face source characteristics for the 8–14 .m band are analyzed. The infrared radiation suppression principle and design method commonly used in ships are evaluated for two kinds of infrared radiation sources. The study defines how various infrared stealth technologies can be effectively applied in ship design. This research can serve as a reference for the design of infrared stealth for a ship.