In this paper, a baffle with an ejector structure is designed to block the high-temperature parts in the infrared suppressor. At the same time, the baffle structure injects ambient cold air to cool its own surface to significantly reduce the infrared radiation of the infrared suppressor. The effects of bow-shaped baffle configuration on the aerodynamic performance, temperature field, and spatial distribution of infrared radiation intensity of the infrared suppressor are studied by numerical simulation. The results show that compared with the nonbaffle structure (Case 0), the baffle structure increases the pumping coefficient of the two-dimensional ejector nozzle by 115% and the thermal mixing efficiency of the infrared suppressor by 273%. Nevertheless, the total pressure recovery coefficient of the infrared suppressor decreases by 7%, and the peak values of the wall and gas infrared radiation intensity are reduced by 46% and 72% within the 3-5 μm band, respectively. Compared with the single bow-shaped baffle (Case 1) structure, the better-designed double bow-shaped baffle (Case 3) can eject ambient cold air with a pumping coefficient of approximately 0.1 and reduce the average surface temperature of its cold side from 638 K to 415 K. The peak values of the wall and gas radiation intensity decrease by 84% and 80% within the 3-5 μm band. In general, the surface temperature of the bow-shaped baffle cold side is affected by the internal eject flow of the double bow-shaped baffle, the stagnation vortex downstream of the bow-shaped baffle cold side, and the cold backflow at the narrow edge end face of the two-dimensional mixing duct.