For carrying out real significant open with regardless of operation system platforms, the open CNC system based on quantum framework was established. The paper introduced principles, architecture and content of quantum framework. And the architecture of open CNC system based on quantum framework was designed. On the basis of architecture, parts of finite state machine modeling of CNC active objects and programs were given in this paper. The results show that quantum framework is a kind of software-bus which can achieve open characteristic of software and loosely coupled of CNC function modules. So the quantum framework carries out real significant open.