Intergraph's Smart Plant P&ID (SPP&ID) is taken as the research subject. Through an analysis of the software's functionalities and validation through engineering practice, this paper focuses on introducing SPP&ID's core technical advantages, such as ensuring design data consistency through rule validation mechanisms, and systematically explores its integrated design capabilities and potential for secondary development. Current research has indicated that engineering designers can enhance the efficiency and quality of intelligent design work by optimizing the automatic export process for piping schedule and adding an automatic calculation module for insulation thickness through secondary development of SPP&ID. This research further validates the core value of intelligent tools in digital collaborative design.