North Pacific subtropical high(H_P) in monthly and seasonal mean sea level pressure fields is a permanent atmosphere activity center in the Northern Hemisphere,which is closely related to the atmospheric circulation and regional climate anomalies.The traits of H_P are briefly described by the area and intensity indices of a closed pressure system,and the indices are used to analyze the climate and abnormal characteristics of H_P,as well as the relationship between H_P and sea surface temperature anomalies in the eastern tropical Pacific.Because H_P significantly weakens in winter,when calculating S and P indices of H_P,it is difficult to find a typical isobar,which can clearly describe the circulation features throughout the analysis period.To solve this problem,a calculation scheme is proposed.Firstly,a higher f₀ is choosed and used to calculate the circulation indices (S and P) in most years.Then a lower f₀ is selected to calculate the circulation indices (Ŝ and P) in a few extreme weak years of H_P.Finally,a simple linear regression equation is used to correct the results from Ŝ and P indices to S and P indices and the complete sequences of the S and P indices are obtained.The application results show that the obtained complete sequence of H_P is appropriate.