Abstract: In this paper, the spatiotemporal variation of the accumulated value of temperature ≥10 ℃ in Tacheng was analyzed using the methods of linear climate tendency, cumulative anomalies, Mann-kendall mutation test and ArcGIS space interpolation based on the daily average temperature data from 6 meteorological stations in Tacheng during the period from 1961 to 2016. The results showed that the first date, last date, duration and accumulated value of temperature ≥10 ℃ in the study area were changed by -0.12 d·(10a)^-1, 0.15 d·(10a)^-1, 0.27 d·(10a)^-1 and 75.39 ℃·(10a)^-1 respectively. Moreover, the mutations of the last date, duration and accumulated value of temperature ≥10 ℃ occurred. The accumulated value of temperature ≥10 ℃ in the study area varied in a range from 2 450 ℃ to 3 950 ℃, and it was higher in the south than that in the north. Compared with the period Ⅱ (1995-2016) and period Ⅰ (1961-1994), the accumulated value of temperature ≥10 ℃ increased to some extent, the proportion of the area with accumulated value (2 450-3 150 ℃) of temperature ≥10 ℃ was reduced obviously, but the proportions of the areas with accumulated values of 3 150-3 450 ℃, 3 950-4 150 ℃ and 4 150-4 250 ℃ were increased.

Key words: accumulated value of temperature ≥10 ℃, M-K test, spatiotemporal change, duration days, climatic trend rate, Tacheng