Abstarct: This Thesis uses, a semi-active suspension system for a quarter car model, using the nonlinear effect by magneto rheological damper. In order to supply the required voltage of the magneto rheological damper, and providing the variable damping necessary for supplying the active force for a semi active suspension system, as well as analyzing the transient and steady state characteristics in response to road disturbances. Control methods such as feedback linearization control and direct and indirect adaptive fuzzy control have been studied and executed. This study asses the stability of controlling system in which the validity of controlling method is confirmed through stability analysis and results of the simulation. At first, feedback linearization control introduced. Adaptive fuzzy control is an efficient controller for uncertainty of nonlinear systems. At the end, direct and indirect adaptive fuzzy controlling method due to robust tracking performance, guarantee of stability and response with high accuracy is suggested. The inputs of fuzzy controller are body’s relocation and velocity. According to the simulation results, the proposed control methods provide comfort for passengers while the vehicle passes a bump, after that, it provides a Vehicle handling which determine the superior performance of the semi-active suspension system in comparison to passive suspension system.