Methane(CH_4)is one of the most important greenhouse gases contributing to climate warming. Understanding the responses of cropland soil CH_4 fluxes to climate warming under different tillage systems is critical to evaluation of the dynamics of soil carbon sink/source along with climate changes in the North China Plain(NCP). A field experiment of simulated climate warming using infrared radiation instrument was conducted to measure CH_4 fluxes from the wheat-maize rotation field with four treatments including conventional tillage with and without warming(CTW and CTN)and no-tillage with and without warming(NTW and NTN). Results showed that during wheat-maize growing period in 20132015 soil temperature at 10 cm soil depth was significantly elevated by 1.5 ℃ in CTW, and 1.4 ℃ in NTW, compared with CTN and NTN, respectively(P<0.05). The warming did not significantly affect soil moisture in these two tillage systems because of irrigation(P>0.05). Furthermore, soil CH_4 fluxes did not show obvious seasonal changes among treatments. However, annual cumulative soil CH_4 uptake showed significant differences among years. During wheat season in 20132014, the cumulative CH_4 uptake in CTW and NTW increased by 35.8% and 108.8%, compared with those in CTN and NTN, respectively(P<0.01). During 20142015, however, it was reduced by 17.7% in CTW, compared with CTN(P<0.05). During maize season in two years, cumulative CH_4 uptake was not significantly affected by experimental warming in two tillage systems(P>0.05). In addition, a significant positive relationship between soil microbial biomass carbon(MBC)and CH_4 uptake was found. Decreased MBC content in CTW indicated that the limitation of climate warming projection on activity of soil organism may reduce the capability of soil CH_4 sink in conventional tillage farmland of NCP.