Abstract: instructions lack sufficient adaptability. They struggle to address issues such as equipment failures，fluctuations in material cutting performance，and strict configuration control in the machining of complex structural parts，thereby restricting manufacturing flexibility and responsiveness. To tackle this pain point，this paper proposes a process system framework for flexible production. Supported by digital twin technology，the framework introduces the concept of a practical implementation model，takes MBD data as the data source，and constructs a process design mode based on design features. An initial practical implementation model is established through a 3D process model，on which basis real-time perception and dynamic adjustment of the production environment are realized， forming a flexible process system. This research aims to improve the flexibility and responsiveness of aviation complex structural part manufacturing，help enterprises quickly respond to market demands，and achieve efficient utilization of manufacturing resources.