Jiangsu Province is the main planting area of winter-wheat (Triticum aestivumLinn) in our country. It has an important practical significance to explore the impact of climate suitability on growth and yield of winter-wheat in Jiangsu under the background of climate change. The model of climate suitability of winter-wheat was constructed using subordinating degree function. The suitable degrees of winter-wheat during different growth stages and full-growth period were calculated in 12 sites of Jiangsu Province, and the temporal and spatial variation of suitable degree also was analyzed. The results showed that: (1) The constructed climate suitability model are suitable to express the climate suitability of winter-wheat in Jiangsu Province. (2) In order to avoid the large difference in meteorological yield of winter-wheat due to the suitability of meteorological factor may be small or zero, the multiplicative model was chosen to express the climate suitability in different growth stages of winter wheat, and the results are satisfactory. (3) There is a generally superior climate suitability of winter-wheat in Jiangsu Province. The suitability of temperature, precipitation, and climate has a weakly increasing tendency, while the sunshine suitability has a weakly decreasing tendency. (4) From the point of view of the suitability degree distribution, the sunshine suitability degree is low in southern of Jiangsu, the precipitation suitability degree is low in northern of Jiangsu, and the temperature suitability degree is generally high. There no great difference in climate suitability of winter-wheat in Jiangsu. (5) There is a low suitability degree of winter-wheat during the seedling-tillering stage in Jiangsu Province. So during this time we should pay attention to the negative influence of freezing injury on growth and yield of winter wheat. (6) The cold accumulated temperature of Ganyu and Xuzhou (On behalf of the North Jiangsu) is bigger and that of Nantong, Kunshanand Dongshan (On behalf of the South Jiangsu) is smaller. This winter freezing index of winter wheat and the calculation results are consistent at the same time period. The winter wheat appeared low temperature damage in the period when sleep before and after the end of dormancy, the late autumn and early winter and late winter and early spring.%江苏省是中国冬小麦（Triticum aestivumLinn.）的主要种植区域之一，在气候变化的背景下，探讨气候适宜程度对江苏冬小麦生长发育及产量的影响具有较大的现实意义。利用隶属度函数构建了气候适宜度模型，对江苏省12个站点的冬小麦各生育期与全生育期的适宜度进行了计算，并分析其时空变化。结果表明，（1）所构建的气候适宜度模型可以用于描述与分析江苏冬小麦的气候适宜程度。（2）为避免在某生育期单个要素的气候适宜度可能很小或为零而导致的与冬小麦气象产量出现较大偏离，选用累乘模型来表达冬小麦各生育期的气候适宜度，效果良好。（3）江苏省冬小麦的气候适宜度总体较好，温度适宜度、降水适宜度和气候适宜度都呈弱增加趋势，而日照适宜度呈逐年微弱减少的趋势。（4）从适宜度分布来看，苏南地区日照适宜度较低，苏北地区降水适宜度较低，各地区温度适宜度总体较高，且气候适宜度的差距不是很大。（5）江苏省冬小麦适宜度偏低的生育期是出苗-分蘖期，因此，在此期间应注意低温冻害对冬小麦生长发育及产量形成的负面影响。（6）赣榆和徐州（代表苏北）的寒积温较大，南通、昆山和东山（代表苏中、苏南）的寒积温较小，这与计算所得的同时段内冬小麦冬季冻害指数的结果是一致的。即冬小麦出现低温危害的时段在进入休眠之前以及结束休眠之后，即秋末冬初和冬末春初。
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