A field experiment was conducted in 2014 to investigate the effects of different cultivation techniques on CH_4 and N_2O emissions in paddy season in a wheat-rice double cropping system by using the method of static chamber-gas chromatographic techniques. The rice cultivar of Su 101 was field-grown. Three treatments such as super high production technology (SP), conventional production technology (CP), and reducing fertilizer of production technology were conducted (RP). The results showed that, (1) The characteristics seasonal variations of CH_4 emissions initially increased, but it eventually declined in the rice growth season under different cultivation techniques. Peak CH_4 flux was during the early growth stage of rice, CH_4 cumulative emission from transplanting to the critical stage of productive tillering accounted for 79.1%~84.5% of the total emission during the rice growth season. Peak N_2O flux was only observed during midseason drainage period. (2) Total CH_4 and N_2O emissions during rice growth season were significantly affected by different cultivation techniques. The order of total CH_4 emissions under different cultivation techniques was SP (423.68 kg·hm~(-2)) > RP (407.51 kg?hm~(-2)) > CP (195.96 kg?hm~(-2)), and the order of total N_2O emissions was CP (3.88 kg?hm~(-2)) > SP (2.96 kg?hm~(-2)) > RP (2.72 kg?hm~(-2)). (3) Combined global warming potential (GWP) of CH_4 and N_2O under SP was 11473.6 kg?hm~(-2) calculated as CO_2, significantly higher than CP and RP. SP increased GWP by 89% and 4.3% respectively compared with CP (6055.7 kg?hm~(-2)) and RP (10998.4 kg?hm~(-2)) calculated also as CO_2. (4) SP significantly increased rice yield at the same time intensified greenhouse effects during rice growth season in the Taihu lake region, but the GWP of per unit rice yield under SP was lower than RP.