Soil samples from the Hexi Corridor located in the arid regions of Northwestern China were collected from a site that had received fertilizer applications for 23years. Effects of freeze-thaw on aggregate stability and the organic carbon (OC) and nitrogen (N) enrichment ratios in water stable aggregate (WSA) fractions were investigated. In treatments combining the application of N fertilizer with green manure (GN) or straw (SN), the percentage of >0.25mm WSA fraction was not significantly different from the control soil that received no fertilizer or organic amendment. After a freeze-thaw cycle, the percentages of the >0.25mm WSA fraction in the GN and SN treatments showed no change, but the size of this fraction in the other treatments decreased. In addition, the organic carbon (OC) and N enrichment ratios in the >0.25mm WSA fraction in GN and SN treatments increased after a freeze-thaw cycle. However, in this size fraction, the OC and N enrichment ratios decreased in other treatments. Both the changes of the percentages of the >0.25mm WSA fraction and the OC and N enrichment ratios in this fraction under freeze-thaw in the GN and SN treatments exhibited the most significant increases compared with other treatments (P<0.05). The results indicated that the GN and SN treatments could prevent the damaging effects of freeze-thaw on aggregate stability and protect soil from erosion.