【Objective】 Freezing and thawing alternation is a natural phenomenon, especially in high latitude areas, like the northeast and northwest parts of China, The oasis in the arid regions where the winter is long with plenty of snowfall are naturally subjected to frequent freeze-thaw alternations in spring. A large number of researches have demonstrated that freeze-thaw alternation could lead to emission of high volumes of greenhouse gas. So, it is supposed that the croplands in the area studied may emit high volumes of greenhouse gases in winter and spring, but dynamics of the emission and fluxes of greenhouse gases emitted during this period are not well documented.【Method】Along-term field experiment was initiated in April 1990 at the National Grey Desert Soil Station of Xinjiang Academy of Agricultural Sciences, and designed to have a total of 12 treatments, among which 5 fertilization treatments, i.e. CK (No fertilization), NPK (nitrogen, phosphorus and potassium), NPKS (0.9NPK + 0.1 Straw nitrogen), NPKM (1/3NPK + 2/3 sheep manure- nitrogen) and NPKM+ (1.5NPKM), were laid out for this study in a cropland of grey desert soil, and emissions of greenhouse gases during the freezing and thawing alternation periods of 2013 and 2014 monitored with the static box method and gas chromatography.【Result】Results show that Treatments NPKM and NPKM+ reached C 113 and 85 mg m^-2 h^-1 on average in CO₂ emission, respectively, relatively higher than the other three Treatments NPKS, NPK and CK, being 72 mg m^-2 h^-1, 75 mg m^-2 h^-1 and 35 mg m^-2 h^-1, respectively. Similarly, Treatments NPKM+ and NPKM was relatively higher in N₂O flux, too, reaching N 73 and 42 µg m^-2 h^-1 on average, respectively, which were obviously much higher than 22 µg m^-2 h^-1 in Treatment NPKS and 17 µg m^-2 h^-1 in Treatment NPK (p<0.05). However, the treatments were all relatively low and did not differ much in CH₄ emission from each other. N₂O emission displayed a significant rising trend in flux during the early freeze-thaw period, but a declining one in the late period. CO₂ emission exhibited a similarly trend, too, but not so strong. The N₂O emission during the freezing and thawing alternation period (27 days) reached N 0.1~0.5 kg hm^-2 a^-1,accounting for 9%~18% of the total of a year, while the CH4 emission during the period accounted for 6%~14% of the total and did not vary much with the treatment. 【Conclusion】The freezing and thawing period in spring is a time period of high frequency in greenhouse gas emission in the oasis of gray desert soil. Especially during the early and mid phases of the alternation period, both CO₂ and N₂O emissions were apparently on a rising trend, but during the late phase they dropped significantly along with the decline of soil moisture content. Among all the treatments, Treatments NPKM and NPKM+ had significantly longer emission periods and higher emission fluxes, while Treatments NPK and NPKS had higher peak values, but short emission periods. In addition, snowfall in winter was found to be a key factor affecting emissions of greenhouse gases. High snowfall could increase the soil water content and sustain the content for a longer period of time, which could in turn prolong the greenhouse gas emission period, while low snowfall could hardly sustain high soil water content for long, thus shortening the emission period. To sum up, all the findings in this experiment demonstrate that the emission of greenhouse gases from farmland of gray desert soil in the oases is high during the freezing and thawing alternation period. So it is necessary to take into account the greenhouse gas emission during this time period, when estimating volume of greenhouse gas emission and its warming potential in this area.