Present study examined the influence of different types of slow/controlled release urea on rice yield and annual greenhouse gas emissions in a paddy field,and assessed the greenhouse gas intensity (GHGI,equivalent to global warming potential GWP/rice yield). The results indicated that the optimized fertilization (OPT) treatment recorded the similar yield with reduced nitrogen fertilizer (21.4%) supply compared with the farmersfertilizer practice (FFP) treatment,and decreased the annual emissions of CH_4 (12.6%) and N_2O (12.5%) during the rice season,and N_2O emission (33.3%) during the fallow period. Application of controlled release urea (CRU) reduced CH_4 emission by 28.9% during the rice-growing season with respect to OPT treatment,and showed negligible CH_4 emission during the fallow season. However,nitrification inhibitor (DMPP) treatment was found to reduce the CH_4 emissions by 41.6% and 76.9%,and N_2O emissions by 85.7% and 6.5%,during the rice growing season and fallow season,respectively,compared with OPT treatment. In the fallow season,the N_2O emissions accounted for 76.8%-94.9% of annual N_2O emissions,which was clearly a key point for evaluation of greenhouse gas emissions in paddy. The average values of GHGI in OPT,CRU and DMPP treatments were 0.50,0.41 and 0.33 kg·kg~(-1), respectively. Considering the benefits of higher rice yield and lower annual greenhouse gas emissions,combined application of urea and nitrification inhibitor could be the best combination in paddy fields.