Abstract: Based on the analyses of the ≥10℃ accumulated temperature data of 80 meteorological stations from 1961 to 2005 in Heilongjiang Province,the changes of accumulated temperature and the evolution trends of the accumulated temperature zone were studied,by using the daily mean temperature,the accumulated temperature calculated by the five-day running average method and examined by the Mann-Kendall method for the sudden change.The results showed that with the global climate warming,the ≥10℃ accumulate temperature in Heilongjiang Province obviously increased over the last 45 years.The decadal change of the accumulate temperature showed a slightly decreased trend in the 1970s,but with obviously increased afterwards.The M-K test results indicated that the accumulated temperature suddenly increased in 1993.Due to the ≥10℃ accumulated temperature progressive increase in Heilongjiang Province,the ≥10℃ accumulated temperature zone obviously moved to north and east.The first accumulated temperature zone moved northwards most evidently with the average longitudinal distance about 0.5 degree,while the third accumulated temperature zone expand eastwards most obviously with the latitudinal distance to two degrees.

Key words: Accumulated temperature change, Accumulated temperature change, Mutation test, Accumulated temperature zone