As the controllable damping property of MR damper has nonlinearity, hysteresis and saturation peculiarities, the development of its controller becomes quite complex. According to the control principle and design function of the MR damper controller, a three-loop controller is proposed based on the fuzzy PID algorithm, which includes an acceleration loop, a voltage loop and a current loop. The controller can effectively ensure the MR system precision and real-time. The hardware design of the MR damping controller and the software design of the DSP control system are introduced in detail, and the bench test is also implemented. The experimental result proves that the design of MR controller is correct and feasible.