A temperature correlation matrix is constructed by NCEP/NCAR reanalysis temperature data of 1948—2005, and the 99% confidence test is used to filter out correlation ‘noise'. We smooth the temperature data with step=5 d,10 d,… and construct correlation matrixes, and find that 365—730 d maybe a turning of time scale of temperature. Global average correlation coefficient Cglobal increases along with step size, but the rate is slower and slower. The positive correlation center（1625°W—775°E，75°N—125°S）（Area Ⅰ） and the negative correlation center（1575°W—325°E，275°—475°N）（Area Ⅱ） are the two areas we concern with, there is strong negative correlation between them. With the help of a 10a slipping window, we find that those 10a Cglobal had an abrupt change between 1981—1987a, and so did Area Ⅰ and Ⅱ. The points of strongest negative correlation on the North Pacific Ocean have been changing from 1948 to 2005.