CH_4 and N_2O emission fluxes were measured in rice paddy field of cold region in Heilongjiang under four moisture management modes by using the method of static chamber-gas chromatograph technique.Four different treatment methods including control irrigation,wet irrigation,intermittent irrigation and flood irrigation were utilized in order to study the CH_4 and N_2O emission characteristics.The results indicated that the CH_4 and N_2O emission peak appeared in the rice vigorous growth period and the emissions reduced in leisure period no matter what kind of irrigation methods were utilized.Compared with flood irrigation,the CH_4 emission of wet irrigation decreased by 27.2%,the CH_4 emission of control irrigation decreased by 34%,and intermittent irrigation model significantly decreased by 48.2%.Flood irrigation paddy N_2O emissions reduced 0.41kg/hm~2 compared to the intermittent irrigation paddy fields,increased 0.38kg/hm~2 compared to control irrigation and increased 0.37kg/hm~2 compared to wet irrigation paddy.With respect to analyzing overall greenhouse effect,water saving irrigation mode can effectively decrease and control CH_4 and N_2O emissions.At rice growth stages,N_2O emissions increased accordingly in the period of CH_4 emissions reduction.By considering the relationship of the growth and decline between CH_4 and N_2O emissions,the paddy fields of greenhouse gas emissions can be effectively slowed down.