Abstract: A motion simulator has a motive device suspended in midair and having a base, a moving panel, twelve universal joints mounted on the base and the moving panel and six actuators connected to the universal joints and being retractable. A seat assembly is hung on the moving panel. Therefore, as the actuators retract, the seat assembly is moved in six degrees of freedom such as heave, sway, surge, pitch, roll and yaw. Audiences sitting on the seat assembly are hung with their feet hanging in the air and therefore feel excited and experience vivid virtual reality. Moreover, the actuators bear axial force such as drag force and thrust force and are endurable and safety.