Abstract: Based on the data of the beginning date of 10℃ during the period 1971-2005 from 71 meteorological stations in Xinjiang and growth period of winter wheat from 14 observation stations,the daily variation of beginning date of 10℃ and its impact on growth period of winter wheat was analyzed.The results showed that the beginning date of 10℃ became earlier,especially since the 1990s.The spatial distribution of the beginning date of 10℃ showed two late-centers.One was situated nearby Hebukesaier.Another was on the neighborhood of Beitashan.There were three regions where the date with ≥10℃ daily average temperature was earlier in southern Xinjiang,including Turpan-Shanshan-Tukeshun Basin,Yanqi Basin,Kashgar and Hotan.The average growth period of winter wheat was earlier generally in the year which the beginning date of 10℃ appeared earlier.The tendency of the green-returning period and rising stage was earlier 1-14 days.The jointing stage was earlier 1-16 days.The mature period was earlier 2-11 days.

Key words: Xinjiang, Beginning date of 10℃, Winter wheat, Growth period