Abstract: In view of problems of uneven powder supply, slagging, inadequate burning and unstable negative pressure existed in current combustion system of pulverized coal boiler, the paper proposed a design scheme of DCS of combustion system of pulverized coal boiler by taking a 20 t heat-conduction boiler as control object. It introduced design of hardware and software of the system in details. The test result showed that the heat-conduction boiler runs stably and each technical index accords with design requirements, which realizes optimal control for combustion system of pulverized coal boiler.