The advantages and its data model structure of STEPNC are introduced. Then some key technology of numerical y control ed system based on STEPNC is described,including the structure of STEPNC control er,generation of its programs,interpretation principle of its files,machining simulation, etc. At the end, it is concluded that this system is characteristic of opening, intel igence land networking.%介绍了STEP-NC的优点和STEP-NC数据模型结构，并对STEP-NC数控系统的关键技术进行了阐述，包括STEP-NC控制器的体系结构，STEP-NC数控程序的生成，STEP-NC解释器的原理，加工仿真等。总结了 STEP-NC 数控技术具有优异的开放性、智能性、网络化特征。
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