The saddle is supported by double crossbeam and the flexibility error is eliminated thoroughly to supply driving system of Y-axis with rapid and steady response capabilities. The hydraulic balancing mechanism guarantees Z-axis with excellent damping capability. The driving system for X1/X2 axis with excellent positioning accuracy and steady response capability includes following components two AC servo motor with large inertia, ballscrews with large lead，linear roller guideways with low displacement damping. Rotating range of C axis directly driven by torque motor is ±200°. Swing range of A-axis, a swing axis, is ±110°. A-axis with highest speed 18000rpm is directly driven by torque motor and an excellent machining position can obtain when A-axis combines with C axis.