To realize the interopration and integration in CNC,a CNC programming model is illustrated.According to CNC function,CNC system data structures are studied and fuction models based on XML Schema are established.The CNC network programming technology is studied,and the CNC software system includes three layers:Web Services requester,Web Services provider and Web Services monitor,thus a CNC programming model based on XML Web Services is established.Web Services in CNC application and equipments are studied.By experiments,the programming model based on XML Web Services is proved to be effective in trans-platform and trans-regional seamless integration and collaborative operation of numerical control equipments.