Freezing injury is one of the most serious agro鄄meteorological disasters of winter wheat in North China, restricting yield and its suitability. Under the background of climate change, the warming trend in China is significant, especially in winter. However, freezing injury of winter wheat during winter still happened sometimes in Huang鄄Huai Winter Wheat Area (HHWWA) , therefore, identify the spatial and temporal patterns of freezing injury during winter under the background of climate change is very important to defense the freezing injury. In this study, based on the daily temperature data of 47 meteorological stations in HHWWA from 1960 to 2010, the trends of accumulated negative temperature and over鄄wintering durations were analyzed, and spatial and temporal variation of freezing injury during winter in HHWWA were identified, taking the accumulated negative temperature as freezing injury indices. Over the past 50 years, the average absolute values of accumulated negative temperature were ranged from 17.3 to 240.8 益 •d, increased from south to north. Moreover, the accumulated negative temperature decreased at a rate of 1. 8-38. 3益•d per decade from 1961 to 2010, and the higher

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