Abstract: Analyses the technology of building up a virtual work-shop environment for ultra-precise component flexible manufacturing lines (UPCFML). Formalized model of UPCFML is built up first, then the frame oriented toward ultra-precise machining is built up. Object models faced on physical reconfiguration and logical reconfiguration are built up separately, which are the entity model and flow-control model based on OOTPN, on this basis virtual environment and reconfiguration systems are realized. Simulation proved that this technology could provide measures and tools to the modelling and analysis of reconfiguration in UPCFML.