In the high-speed-high-accuracy servo control system, the predictive observer can eliminate the phase lag and sampling noise. However, the traditional servo system using PID controller can not provide ideal control performance even if the predictive observer is applied. Therefore, a two-degree-of-freedom(2-DOF) control structure using predictive observer is proposed, and the algorithm is implemented in the linear motor velocity controller based on the wire bonder X-Y platform. Simulation and experimental results show that the proposed algorithm can not only improve the tracking performance, but also increase the velocity and position responsiveness of the servo system.