［Objective］In response to the structural characteristics of the dual end layout for underground station equipment, fully utilize the configuration of BAS (building automation system) A-end and B-end PLC (programmable logic controller) equipment, and maximize the system redundancy, a networking optimization and multi-level redundancy scheme for station BAS is investigated.［Method］A method of implementing the networking optimization and multi-level redundancy for metro BAS and PLC systems is proposed. This method improves the original system architecture through non-differentiated networking of multiple controllers and remote I/O (input/output), multi-level PLC redundancy architecture, and operational strategy optimization.［Result & Conclusion］The optimized system effectively prevents station BAS from becoming uncontrollable in the event of a master PLC failure, thereby enhancing the overall system reliability and emergency response capability. In particular, under extreme conditions, the optimized system ensures the stable execution of emergency modes to the greatest extent possible, effectively safeguarding station operational safety.