This paper is mainly intended to study the application of voice coil actuator to active vibration control incorporated with passive isolator in order to suppress the resonant vibration of natural frequency. The theoretical equations which govern the system vibration is developed. Based on these equations, physical mechanism of voice coil actuator is discussed, and the influence on motion behavior of active control system due to different quantities feedback will be studied. Firstly, the relationship between the electromagnetic force of voice coil actuator, input voltage, and relative velocity between voice coil and magnet is established. This equation is substituted into motion equation of passive isolation system, and the transmissibility of active/passive hybrid isolation system is obtained. Then, analysis of computer simulation based on theoretical equations will be carried out to study the influence on motion behavior of active control system due to different quantities feedback.