Abstract: Based on the characteristics of underwater vehicle motion near sea bottom, a mathematical model of maneuvering motion for underwater vehicle is proposed. The influence of sea bottom on the maneuvering hydrodynamic forces of underwater vehicle is analyzed. A numerical simulation method is applied to an underwater vehicle＇s maneuvering motion when it moving near sea bottom. The calculation resuits indicates that the sea bottom has great influence on the maneuverability of underwater vehicle.