Abstract: In response to challenges in the development of 3D design for shaft and roadway engineering, such as complex software operations, high learning costs, heavy modeling workloads, and the lack of standardized design processes, a modular application study was conducted in the 3D design of shaft and roadway engineering. The application framework of the modular concept was introduced. Based on the Dassault 3DE platform, a modular decomposition design for shaft and roadway engineering was carried out. Using CAA secondary development technology, an invocation tool for component modules was developed, unifying the module invocation method and enabling rapid module invocation, thereby forming a complete application process for 3D design of shaft and roadway engineering. Practice has shown that this research can effectively reduce the difficulty for designers in performing 3D design and decrease the workload associated with 3D modeling.