【Objective】In order to provide theoretical basis for sequestrating carbon and reducing CO2emission on farmland.【Method】A field experiment was conducted to investigate the effects of different cropping systems on farmland CO2emission,by using a CFX-2portable infrared analyzer to measure the soil respiration rate under 7various cropping patterns in the oasis region of Hexi Corridor,Gansu Province.【Result】Soil respiration rate of various cropping systems had an explicit regular change of seasonal variations. Monoculture maize had the highest fluctuation range,with the range increased at first growing stage and decreased at last with maize harvest.The values order of averaged soil respiration rate were:sole maize(M)> maize//pea(M//P)> wheat//maize(W//M)> wheat-winter rape(WsRw)> wheat-winter wheat(WsWw)> wheat-spring rape(WsRs)>spring rape-potato(RsP).The absolute value of soil respiration rate differed significantly(P<0.05)among treatments.Sole maize had the highest soil respiration rate,while spring rape-potato had the lowest,which was 1/4.6to sole maize.The soil respiration rate of wheat and maize strips in intercropping was decreased by 20.9% and 26.3% as compared to the corresponding sole cropping,respectively.【Conclusion】Spring rape-potato multiple cropping was the optimal treatment in reducing farmland greenhouse gas emissions and thereby mitigating global climate change among the 7tested modes.Intercropping,as well,potentially decreased the soil respiration rate both in pea// maize and wheat//maize.