Increased greenhouse gases emission contributes to global warming.Paddy field is considered to be one of the main sources of greenhouse gas CH_4 and N_2O emissions.The rice planting area in the Jianghan Plain is about 8*10~5 hm~2,accounting for about 40% of the total rice planting area in Hubei Province.Studies on characteristics of greenhouse gases emission in the Jianghan Plain are important for evaluation and reduction of regional greenhouse gases emission.So far,several models,such as DNDC model,have been used for simulating the greenhouse gases emission,which in conjunction with ArcGIS may be used for simulating the regional greenhouse gas emission.In this study,we used DNDC model to simulate the greenhouse gases emission in the Jianghan Plain.The field experiment was carried out for investigating the characteristics of CH_4 and N_2O emissions under rice-wheat (RW),rice-rape (RR) and rice-fallow (RF) cropping systems.Meteorologic,soil,crop and field management data were obtained for DNDC-stimulating CH_4 and N_2O emissions under different cropping systems in the Jianghan Plain.The results of field experiment showed that the CH_4 fluxes were from -2.80 mg·m~(-2)·h~(-1) to 55.64 mg·m~(-2)·h~(-1),and the N_2O fluxes were from 0 to 1.90 mg·m~(-2)·h~(-1) in the Jianghan Plain.CH_4 emission was mainly concentrated in rice season,and the peaks occurred at rice heading and tillering stages.N_2O emission in rice season was higher than in non-rice season.And the peaks occurred after wheat or rape sowing in non-rice season and during field drying period in rice season.CH_4 emission under RW and RR systems were significantly higher than that under RF system,while N_2O emission was significantly higher under RF system than under RW and RR systems.The DNDC model stimulating results were verified by comparing the observed values with the stimulated values.The R2 and RAE between the observed and the stimulated values under different cropping systems were form 0.85 to 0.98 and from 8.29% to 16.42%,respectively.The high R2 and the low RAE suggested that the stimulated values of CH_4 and N_2O emissions with DNDC model were in good agreement with the observed values.According to the simulation results,the annual emissions of CH_4 and N_2O were 0.292 9 Tg C and 0.009 2 Tg N in the Jianghan Plain from 2010 to 2016,respectively.For different crop systems,CH_4 and N_2O emissions were presented as RW >RR >RF and RW >RF >RR,respectively,and the global warming potential (GWP) was RW >RR >RF.The CH_4 and N_2O emissions were also different for different regions.The annual average CH_4 emission from 2010 to 2016 was in the order of Jianli >Jingmen >Gong'an >Tianmen >Xiantao >Honghu >Songzi >Hanchuan >Qianjiang >Shishou >Jingzhou >Jiangling >Chibi >Jiayu.And the annual average N_2O emission from 2010 to 2016 was in the order of Jianli >Jingmen >Gong'an >Honghu >Xiantao >Tianmen >Hanchuan >Qianjiang >Songzi >Jingzhou >Jiangling >Chibi >Shishou >Jiayu.The results of our study indicated that the DNDC model could preferably stimulate the greenhouse gases emissions in the Jianghan Plain.And RR and RF could reduce CH_4 and N_2O emissions compared with RW.