Sewage irrigation in rice-wheat rotation likely lead to more nitrogen (N) loss via ammonia (NH₃) volatilization and nitrous oxide ((N₂O) emission. A stimulated lysimeter study was conducted to evaluate the impacts of sewage irrigation with different nitrogen (N) concentration irrigation on NH₃ volatilization, (N₂O emission and crop yield. The four treatments received equal optimal N input (225 kg/hm² in rice season and 150 kg/hm² in wheat season from urea fertilizer were 1) clean water irrigation as the control (CK), 2) sewage irrigation with low N concentration (SI-L), 3) sewage irrigation with medium N concentration (SI-M) and 4) sewage irrigation with high N concentration (SI-H). Results in rice season showed that NH₃ volatilization and(N₂O emission increased with the N concentration of irrigated sewage, and the determination coefficient (R2) were 0.895 and 0.998, respectively. Sewage irrigation significantly increased the NH₃ volatilization by 19.7% – 40.8% compared with the control, and the SI-H treatment significantly increased the (N₂O emission by 68.8%. Sewage irrigation did not increase the rice grain yield. Data in the wheat season suggested that NH₃ volatilization and (N₂O emission also increased with the N concentration of irrigated sewage, and the determination coefficient (R²) were 0.939 and 0.980, respectively. Herein, 20.2% higher NH₃ volatilization compared with the control was measured in the SI-H treatment. The SI-M and SI-H treatments significantly increased the(N₂O emission in wheat season by 64.9% and 120.3%, respectively. The SI-H treatment significantly increased the wheat production by 46.7%. The results suggest that NH₃volatilization and (N₂O emission must be considered when sewage irrigation was occurred in paddy field and more rational water and N fertilizer management should be adopted when paddy soil was explored to treat sewage water.