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1. Overview: With the rapid development of industrial automation technology, Distributed Control Systems (DCS) have been widely used in various PVA manufacturers. Since 1999, our company has adopted DCS systems from companies such as Honeywell, Yokogawa, and ABB as its production control systems. As an essential component for monitoring industrial production processes, DCS determines the stability and proper operation of the entire production process. In the event of a failure in the DCS system, it can lead to fluctuations in the production process that affect product quality; in severe cases, it may result in the shutdown of the entire production line. Thus, it ensures reliable and stable operation and extends its service life. It is extremely important for the DCS system to optimize its performance and ensure the continuity and safety of production. The DCS system and other computer devices are composed of electronic components and large-scale integrated circuits, featuring a compact structure; moreover, the control components utilize redundant fault-tolerant technologies, thereby enhancing operational reliability. However, due to factors in the installation environment (such as temperature, humidity, dust, corrosion, power supply, noise, grounding impedance, vibration, and rodent infestations) as well as usage issues (such as component aging and software failures), it is not possible to ensure the long-term reliable and stable operation of a DCS system. Therefore, proper management and maintenance of such systems are crucial. Based on my many years of experience in managing and maintaining DCS systems, I would like to share my views for everyone’s reference. 2. Preparatory work before maintenance 3. Maintenance of the DCS system 4. Conclusion For the maintenance of DCS systems, it is crucial to prioritize prevention. As system maintenance personnel, one should develop scientific, reasonable, and feasible maintenance strategies and methods based on the system configuration and the control requirements of the production equipment. By combining preventive maintenance with routine maintenance, systematic, planned, and regular maintenance can be carried out to ensure that the system operates properly over the long term under required conditions. This helps to maintain stable control of the production process and ensures reliable performance, thus providing a solid foundation for achieving production and efficiency goals.