Abstract: This paper introduces the design of a control system aiming at reducing the amount of volatile organic compounds (VOCs) released in the atmosphere based on catalytic combustion technology. The controlled member is reverse flow reactor (RFR) and controlled by PLC system. Firstly，the control objective is given according to the theoretical knowledge. Then the control scheme，hardware configuration of the system and the program design is presented. At last an example is offered to prove the validity of this system.