Abstract:Focusing on the single control mode of NC machine tools, not adapting to the cultivation of the practical talents in CNC maintenance technique, a new “Trinity(closed loop , semi closed loop,openloop control systems),” NC machine tool for teaching was developed. The machine tool could be used to complete the engineering teaching projects, such as open loop, semi closed loop, closed loop servo control systems. The design process of the key technology and debugging method of the equipment were described. The verification of the positioning accuracy on the machine tool was carried out, the desired design purpose was achieved.