Except the well-known AMO (Atlantic Multidecadal Oscillation) with a period of 70 years in North Atlantic, longterm climatic records such as Central England Temperature (CET) and Greenland ice core net snow accumulation data also show a significant 20-year oscillation. 10-50-year bandpass and extended empirical orthogonal funtion (EEOF) method have been used on CCSM4 piControl SST to get counterclockwise rotational mode of SST dipole in subpolar North Atlantic. SAT of England and Greenland region in CCSM4 piControl simulation represent 20-year period, which is the same as rotational mode of SST dipole in subpolar North Atlantic. Conclusion can be drawn that SST rotational mode with 20-year period may be related to climatic variability with 20-year period in the vicinity. The community atmosphere model version 4 (CAM4) is used running sensitive experiment with quasi-20-year period rotational mode of SST as its forcing field to further prove the relationship between SST rotational mode with quasi-20-year period in subpolar North Atlantic and climatic varibility with same period in the vicinity.