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The embedded and field-bus technology have a profound impact on industrial control area. The paper design an embedded numerical control (NC) system based on ARM, the embedded NC system has the characteristics of high precision, low cost, good openness and so on. Through extend CAN bus interface circuit on ARM which can realize the network of embedded NC system. The network for embedded numerical control system based on CAN bus can realize one computer control more NC tools and resolve the problem of low real-time which result from network transmission. The realization of system can improve efficiency of NC process and enhance real-time ability.