Abstract: A method for automated generation of process models based on feature association and intelligent reasoning is proposed in this paper to address the issues of manual modeling dependency, low efficiency, and poor consistency in traditional 3D process design. Through feature recognition, machining reasoning, and intelligent process planning, a complete process knowledge chain is constructed, enabling the “one-click” generation and update of process models. The system supports automatic PMI annotation, intelligent association of process resources and parameters, and structured input of process descriptions, significantly enhancing the automation level and standardization of process design. The business logic, technical architecture, core algorithms, and implementation process of model generation are elaborated in this paper. The effectiveness of the method is verified through application examples, providing a feasible technical path for the intelligent upgrade of 3D structured process design.