Disclosed is a method for reducing motion sickness in virtual reality (VR) of a user, comprising determining a pattern of force cue based on a motion signal of a locomotion in the VR, the pattern of force cue including a type of force cue, a position of application or a direction of application, a time of application, and an amplitude of force cue, and applying a force cue to a head of the user according to the pattern of force cue, wherein the force cue corresponds to an inertial force and/or a centrifugal force in connection with the motion signal. Also disclosed is a head-mounted device thereof.