This product is to assist people who are having difficulties to walk due to amputation. Artificial leg have minimum dynamic constraint which unable to closely mimic the real behavior of human leg. A potentially more effective method is the use of an actuator to apply damping force using MR damper. Magneto rheological damper is a damper filled with magneto rheological fluid. Semi active control devices have received significant attention because they offer the adaptability of active control devices without requiring large power sources. By using MR fluids to produce controllable dampers, we can estimate how much torque was needed in order to produce force for variable velocity.