Measurements of N_2O emissions from conventional rice cultivation (CRC), CRC with straw mulching, system of rice intensification (SRI) and SRI with plastic film mulching were conducted through static chamber/gas-chromatography techniques. The results show that daily fluctuation of N_2O emissions in jointing stage are much higher than in others. A type peak of N_2O seasonal emission presented between jointing and bearing stages companying with high daily average temperature and low precipitation. Biomass and leaf stomatal conductance were observed. Total quantities of N_2O emission were budgeted. The results showed that after jointing stage the average N_2O emission flux of SRI with plastic film mulching increased significantly than CRC with straw mulching and SRI, the leaf stomatal conductance of those showed the same trend (p< 0.05 ). Yield and total quantity of N_2O emission in CRC with straw mulching enhanced 13.7% and 10.7% compared with those of CRC, respectively. The total quantity of N_2O emissions reduced 3.6% in SRI with plastic film mulching compared with CRC, however, the yield increase of that was not significant. Measurements of N_2O emissions from conventional rice cultivation (CRC), CRC with straw mulching, system of rice intensification (SRI) and SRI with plastic film mulching were conducted through static chamber / gas-chromatography techniques. The results show that daily fluctuation of N_2O emissions in jointing stage are much higher than in others. A type peak of N 2 O seasonal emission presented between jointing and bearing stages companying with high daily average temperature and low precipitation. Biomass and leaf stomatal conductance were observed. Total quantities of N_2O emission were budgeted. The Results showed that after joiningting stage the average N_2O emission flux of SRI with plastic film mulching increased significantly more than CRC with straw mulching and SRI, the leaf stomatal conductance of those showed the same trend (p <0.05). Yield and total quantity of N_2O emission in CRC with straw mulching enhanced 13.7% and 10.7% compared with those of CRC, respectively. The total quanti ty of N_2O emissions reduced 3.6% in SRI with plastic film mulching compared with CRC, however, the yield increase of that was not significant.