Abstract: The higher temperature of the flue gas after wet desulfurization is helpful for its diffusion of pollutants into the air， but there are more problems existing in the engineering applications of gas-gas heaters． Based on comparison and analysis of the current flue gas reheating technologies，the comprehensive reheating technology compost of gas-gas heater and steam-gas heater was selected for a thermal power plant． It was proved to have the ability to reduce the possibility of corrosion as well as device blocking，and improve the operational stability of the system． So it can provide references for the similar wet flue gas reheat systems．