The vestibular organ of the inner ear is the balanced sensory organ of the human body, including three pairs of semicircular canals and the oval sac and balloon of the vestibule. There is ampulla crest in semicircular canal and otolith (also called capsule point) in elliptic capsule, which is the vestibular terminal receptor and can feel the stimulation of various specific motion States. The semicircular canal is stimulated by angular acceleration (deceleration), while the balloon of elliptical sac and balloon is stimulated by horizontal or vertical linear acceleration (deceleration). When the vehicle we ride rotates or turns (for example, the car turns and the plane moves in circles), the angular acceleration acts on the corresponding semicircular canals on both sides of the inner ear. When the hair cells in the ampulla of a semicircular canal are stimulated to bend and deform to produce positive potential, the opposite hair cells bend and deform to produce negative potential (negative voltage), and the exciting or inhibiting electrical signals of these nerve endings are transmitted to the vestibular center through nerves and perceive this movement state; Similarly, when the riding tool changes linearly in acceleration (deceleration), these stimuli make the hair cells of the vestibular elliptic sac and balloon ... These stimuli make the hair cells of the vestibular elliptic sac and balloon deform and discharge, and angular acceleration acts on the corresponding semicircular canals of the two inner ears, but everyone's tolerance for the intensity and time of these stimuli is limited. If the stimulus exceeds this limit, there will be motion sickness symptoms.