Increased nitrogen (N) availability resulting from N addition may modify N turnover and nitrous oxide (N2O ) emissions in regions experiencing freeze-thaw cycles, where relatively high N2O emissions from soils are frequently reported during freeze-thaw periods. However, the response of soil N2O emissions during freeze-thaw periods to N addition remains unclear. In this study, we compiled 675 paired observational cases from 36 peer-reviewed articles to perform a meta-analysis assessing the effects of N addition on N2O emissions during freeze-thaw periods and to identify the associated key factors. Our results indicated that N additions increased the available soil N pool, thereby enhancing N2O emissions ( (ln R ')over bar was 0.795 with a range of 0.7-0.89 at a 95% confidence interval) primarily associated with denitrification processes during freeze-thaw periods. N additions during the previous fall had the most significant impact on increasing N2O emissions during the subsequent freeze-thaw periods. The application of manure and NO3- fertilizer has been shown to significantly enhance N2O emissions compared to other fertilizer types. The rate of N addition directly contributed positively to N2O emissions during freeze-thaw periods. Altitude was identified as the primary factor influencing N2O emissions in response to N addition. Along the altitudinal gradient, the increase in N2O emissions resulting from N addition was more pronounced at lower altitudes (<3000 m) compared to middle and high altitudes (>3000 m). Our meta-analysis elucidates the stimulatory effects of N addition on N2O emissions during freeze-thaw periods, identifying denitrification and soil N availability as primary drivers. Crucially, our findings indicate that projected increases in anthropogenic N inputs, when coupled with the climate-induced intensification of freeze-thaw cycles and snow cover reductions, could substantially amplify non-growing season N2O pulses. This synergistic interaction constitutes a critical, yet potentially underestimated, positive feedback mechanism in global N2O budgets and climate projections.