【Objective】In order to study the effects of water management-nitrogen fertilizer on greenhouse gas(CH₄, N₂O and CO₂)emission and soil physicochemical properties.【Method】Two irrigation modes including controlled irrigation(C1)and normal irrigation(C2), and three nitrogen application levels(low nitrogen, N1; medium nitrogen, N2 and high nitrogen, N3)were set up under a long-term pilot plot. 【Result】 The results showed that compared with normal irrigation, controlled irrigation significantly reduced the cumulative emissions of CH₄ and N₂O by 43.12% and 23.53%, respectively. Under normal irrigation, the contents of soil ammonium nitrogen in low nitrogen, medium nitrogen and high nitrogen treatments were 35.26, 38.90 and 35.20 mg·kg^-1, respectively, while those under controlled irrigation were 33.08, 34.30 and 42.40 mg·kg^-1, respectively. Under the condition of controlled irrigation, CO₂ emission was higher than that of conventional irrigation and increased with the increase of nitrogen application level. According to the overall analysis of the Greenhouse Effect, the GWP(global warming potential)of 0.55 t·hm^-2 under controlled irrigation was much lower than that of 0.82 t·hm^-2, under conventional irrigation, while the GWP of 0.65 t·hm^-2 under N2 treatment was much lower than that of 0.74 t·hm^-2 under N1 treatment and 0.67 t·hm^-2 under N3 treatment. The coupling of water and nitrogen was the main factor affecting N₂O emission from the paddy field, and under medium and high concentration of nitrogen application, the contribution of N₂O emission from the paddy field to the Greenhouse Effect was greater than that of CH₄. 【Conclusion】Therefore, the application of controlled irrigation combined with reduced nitrogen fertilizer can effectively decrease the emissions of greenhouse gases, maintain a high level of soil ammonium nitrogen in paddy soil, which is of great significance for improving soil fertility quality and developing sustainable agriculture.