Variations of Arctic sea-ice in four sectors and their ralations with autumn temperature in China are studied in this paper by use of the monthly 1°×1°sea-ice concentration data of Hadley center from January 1953 to February 2003 and the monthly temperature data at 160 stations in China.The results show that the sea-ice concentration of various seasons all exhibited a distinctive linear dencending trend in four sectors in the last 50 year,and the decrease in sea-ice concentration was fastest in the European sector in spring and summer.The beginning time of the abrupt change of the seaice concent ration for various seasons was different,it was 1970’s for spring and summer concentrations while 1980’s for fall and winter concentrations.The sea-ice concentration of various sectors displayed an interdecadal variation as well as distinctive seasonal ans regional differences.The distinctive correlation areas between the sea-ice of sector Ⅰand the autumn temperature in China lay in the Hetao area,the mid-reach of the Yangtze River and part of Xinjiang.The sea-ice in sectors Ⅰand Ⅱ were significantly correlated with the 2-year and 1-year later autumn temperature in China,respectively.