The suspension systems currently in use can be classified as passive, semi-active and active. The passive suspension systems are the most commonly used due to their low price and high reliability. However, this system cannot assure the desired performance from a modern suspension system. An important improvement of the suspension performance is achieved by the active systems. Nevertheless, they are only used in a very reduced number of automobile models because they are expensive and complex. Another disadvantage of active systems is the relatively high energy consumption. The use of noise cancellation technique reduces the complexity and cost of the active suspension system. In this paper, a mathematical model of active suspension system is proposed using noise cancellation technique.