The application relates to a method for calculating the speed attenuation coefficient of personnel walking in any direction when a ship body is inclined, and provides a method for calculating the speed attenuation coefficient of personnel walking in any direction when a ship body is inclined (heeled or tilted), which is reliable in theory, clear in concept and easy to realize, and can be used for calculating the walking speed of personnel on a ship (especially a passenger ship) in any direction when the ship body is inclined, so as to provide reasonable basic data for calculating the escape and evacuation time of personnel on the ship, reasonably planning the evacuation path and escape exit of personnel on the ship.