The relationship between the Arctic sea-ice concentration (ASIC) and s ummer mean maximum air temperature (MMT) in China is analyzed by using Singular Value Decomposition(SVD), ASIC data and MMT data of 160 stations in China from 1 951 to 2002. The results show that ASIC reduced significantly in 1978/1979 and s till kept the low value after 1979. The response of MMT to the abnormal of SIC has 9 -13 months lag. The response patterns are opposite phase for South China or Nort h China, and same phase for central China areas. It is necessary to focus more a ttention on the Arctic sea-ice extent in the mechanism and prediction of summer MMT variation in China.