Based on the data of winter wheat experimental field and meteorological data in Xifeng and Tianshui agrometeorological experiment stations and Pingliang and Chenxian agrometeorological observation stations from 1981 to 2008, the models of climate suitability had been established. The dynamic variation of climate suitability in the whole growth period from 1971 to 2008 was evaluated. The results showed that the suitability degrees of temperature, light, precipitation and synthesized climate were 0.77, 0.66, 0.50 and 0.60 respectively during the whole growth period of winter wheat. It is indicated that the temperature and light suitability degree increased by 0.001 and 0.0014 every year respectively and precipitation suitability degree decreased by 0.0013 every year from 1971 to 2008. The accumulated departure of temperature and precipitation suitability degree increased by 0.006 every year and accumulated departure of light suitability decreased by 0.0923 every year from sowing to stopping growing period in recent years. The accumulated departure of temperature decreased by 0.0254 every year and light suitability increased by 0.0139 every year during the overwinter period in recent years. The accumulated departure of temperature and light suitability decreased by 0.0497 and 0.0186 every year respectively from reviving to heading period in recent years. But the accumulated departure of precipitation increased by 0.0262 every year since 1971 and the meteorological condition was becoming better in this growth period. The accumulated departure of temperature and precipitation suitability degree decreased by 0.0031 and 0.016 every year and the accumulated departure of light suitability degree increased by 0.0637 every year during heading to mature period in recent years. The synthesized results of all climatic factors trended grim in this period. Precipitation was main limiting factors during the later growth period of winter wheat. We suggested that countermeasures for climate change should be modified in accordance with climate suitability in order to utilize climate resource effectively.
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