To explore the infrared radiation characteristics of double serpentine 2-D exhaust system with different blocking rates， the wall temperature distribution and infrared radiation characteristics of serpentine 2-D exhaust system with shield ratios of 55% and 100% are experimentally studied and compared with the corresponding reference axisymmetric exhaust system. The results show that the overall temperature of the serpentine nozzle wall is about 25% higher than that of the reference axisymmetric nozzle， and there is a local high temperature area near the upper wall downstream of the first turning. After increasing the shield ratio of the serpentine nozzle， the temperature gradient intensifies and the heat stress concentration. Compared with the reference axisymmetric nozzle， the serpentine 2-D exhaust system with 55% and 100% shield ratios has outstanding infrared suspension effect， and the rear（α=0°） infrared radiation intensity is reduced by 77.7% and 79.3%， respectively. From the comprehensive evaluation of temperature and infrared radiation intensity， the shield ratio is not the best for full occlusion. After the shield ratio is increased from 55% to 100%， it can only effectively suppress the infrared radiation of the upper detection surface α=5° and 10°， and hardly change the other backwards . The infrared radiation in the detection direction should be weighed and optimized during engineering design.