[Objectives] The aim of the paper is to explore rational management in low-carbon agricultural production and straw resource reclamation. [Methods] A typical dryland in China North Plain was selected and different levels of N application with biochar/straw were set up in this study to investigate the combination effect of the way of straw return under N levels on greenhouse gases emission,crop yield throughout a year-round field experiment. Seven treatments were conducted on the cinnamon soil from Xinxiang,Henan Province,including non-fertilizer treatment(CK),total fertilizer treatment(SN100 and BN100),10% of N-reduced treatment (SN90 and BN90) and 20% of N-reduced treatment(SN80 and BN80)with straw/biochar respectively. The greenhouse gases (CO_2,CH_4 and N_2O) were monitored through the whole growing season using the static chamber-gas chromatograph method,and the crop yields were also determined in a wheat-maize rotation. [Results] The amount of N fertilizer could be reduced 10%-20% under the two ways of straw return under the premise of yield stability. But the reduced amount of N fertilizer was related to crop type. The N_2O emission decreased with the amount of N application. A small sink effect was found in CH_4 emission among each treatment. Emission of CO_2 increased with the reduction of N application for straw return,while it decreased with the reduction of N application for biochar return. Considering crop yield,the GHGI was significantly decreased by 36.40%-40.48% and 40.48%-53.50% under straw return and biochar application compared to that of SN100,due to N fertilizer reduction respectively. [Conclusions] Biochar amendment was a feasible management to stabilize crop yield in the way of reduction of N fertilizer and low carbon production in dryland.