Abstract : Present trend is to design vehicles to provide maximum comfort to the driver and passenger in spiteof the different road conditions. Suspension system is one of the part of vehicle which gives ride comfort.Suspension system plays major role in absorbing road vibrations and provides effective comfort to the diver aswell as passenger. This paper presents performance comparison of passive and semi-active suspension systemof a quarter car model for different vehicle velocities for half sine wave bump and then for different roadprofiles using MATLAB SIMULINK. In semi-active suspension system with Proportional-DerivativeIntegrator (PID) controller is developed which gives optimal and robust system by withstanding different roadconditions and vehicle speeds to increase ride comfort