Aiming at the problem of irregular information collection and inconsistent information communication of heterogeneous CNC systems,taking NC machine tools as the research object,an information modeling and communication scheme was proposed for NC machine tools based on OPC UA.Using the OPC UA information model mechanism,an extensible description model was established for CNC machine tools.Using the OPC UA development kit,an OPC UA server was established.The information model was mapped to the OPC UA server node.The OPC UA client could browse and modify the information model by accessing the server.The research results show that using this program to test and verify the CNC system GJ430,the standardized communication of the CNC system is realized,which provides reference for the interconnection of CNC machine tools.