By investigating the SST departure pattern features over the North Pacific(60°N～20°S),the North Pacific oceanic current segment is found to be the strongest SST anomaly sector in the midlatitude Pacific,together with the discussion of the interrelation between the SST area and at mospheric ci rculations. By comparing the in teraction between the equatorial central/eastern Pacific SST anomaly and atmospheric circulations,a remarkable PNA pattern is found to be in the atmospheric circulation. Besides,the atmospheric circulation serves as the initiator for the interplay between midlatitude North Pacific SST anomaly and Northern atmospheric circulations.