| In terms of the real data, the mass stream function is calculated by two methods, results indicate that both methods fit well with the need for calculating the climate and its anomaly of the mean meridional circulation. The seasonal variation of the mean meridional circulation and the double-level structure of the Hadley circulation are analyzed by the two methods. The paper also studies the zonal difference of the anomalous meridional circulation and the impacts of El Nino /La Nina events on the local meridional circulation anomaly. Conclusions are drawn as follows: 1, The Hadley circulations in both hemisphere and the position of their joint uprising branch move wholly with the heat equation, with most north in July and most south in January. The strengths of hemispheric Hadley circulations are strong in winter and weak in summer, which have one-year oscillation period. 2, It is basically equivalent of the strengths of the both hemispheric Hadley circulations in April and October. 3),The joint uprising branch is located around the equation, basically on the summer hemispheric side, and it is strong in January and July and weak in April and October, which has a two-year oscillation period. 4, There are obvious differences of the seasonal variations of the Hadley circulations and the strength and position of their joint uprising branch. The strengths of winter Hadley circulations and their joint uprising branch is strong in the south hemisphere and weak in the north, with it is nearer to the equation in the south hemisphere than in the north of their centers. 5, There is extremely difference of the locally climatic meridional circulations, as well as there is obviously different seasonal changes. 6, The zonal difference and seasonal change of locally anomalous meridional circulation are great. The meridional circulation anomaly over the Pacific Ocean relates closely with the El Nino /La Nina events.
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