针对偏苯三酸酐难以规模生产的问题，提出并实现了偏苯三酸酐生产过程计算机分布式控制系统，该系统自投入使用以来，运行可靠，性能良好． Aiming at the problem that trimellitic anhydride is difficult to be mass-produced, a computer distributed control system for trimellitic anhydride production process is put forward and implemented. Since the system was put into operation, the system has reliable operation and good performance.