By the extended empirical orthogonal function (EEOF)method the 30 hPa mean monthly height and temperature fields are expanded, yielding the first four eigenvector fields as well as their variance eontributions and structural characteristics. The circulation regimes typical of the eigenvector fields in winter and summer half years are described.At last periodicity analysis is made for time coefficients by the maximum entropy spectrum method and the major periods for the change of the canonical circulation intensity with time are thus revealed.