[Objective] To evaluate the effects of soil water change and alternate drying and wetting on soil CO₂ emissions in order to provide basis for soil carbon cycle in oasis farmland.[Methods] Soil samples were taken from oasis farmland in Xinjiang region, which was used for incubation experiment in laboratory. CO₂ concentration was analyzed by meteorological chromatograph.[Results] (1) Compared with 60% WFPS(water filling soil porosity), 40% WFPS had a significant inhibiting effect on soil CO₂ emissions(p<0.05), while 80% WFPS was no significant influence on soil CO₂ emissions(p<0.05). At the end of the experiment, compared with 60% WFPS, accumulation of soil CO₂ emissions of 40% WFPS was reduced by 26%(p<0.05), while accumulation of soil CO₂ emissions of 80% WFPS was increased by 0.04%(p>0.05). (2) After multiple wet dry cycling, soil CO₂ accumulative emissions under alternate drying and wetting condition was significant lower than that of constant moisture treatment(p<0.05). Under different drought intensity, the effect of severe drought on soil CO₂ emission rate was higher than that of the moderate drought. But after multiple wet dry cycling, the effect of severe drought on the accumulation of soil CO₂ emissions was lower than that of moderate drought(p<0.05). With the increased of drying and wetting alternation, the effects on soil CO₂ emission rate was reduced significantly, especially for maximum soil CO₂ emission rate.[Conclusion] Drying and wetting alternation can reduce soil CO₂ emissions, and the amount of reduction increases with the increasing of drought intensity in Xinjiang oasis soil.