As a new type of entertainment venue, four-dimensional cinema can make the effects of rock, collision and weightlessness using innervation seat controlled by a computer. At the same time, audience can feel the film scene such as storm, thunder, rain, bounce, spray and beating in the cinema. So the performance of innervation seat directly influences the effects of a four-dimensional cinema. In this paper, a compact innervation seat driven by four air cylinders is designed. The kinematics and dynamic characteristics of the seat are analyzed based on Adams. Then, the modal characteristics of the seat are analyzed by Adamas/vibration. Finally, the defects of the mechanism and the improving methods are suggested so that the innervation seat can be more safety and comfortable.