By using a fully coupled model，the atmosphere and ocean coupled fields in the tropical Pacific have been analyzed from the double CO2experiment，in view of the change of the trend as well as its associated mechanism, It
is shown that results from the coupled model share the similar characteristics with those from observation, in which sea surface temperatures (STT)increase over the whole tropical Pacific and have greater amplitudes in the west than
that in the eastern part.This pattern may be mainly due to the enhanced trade wind and cold upwclling close to the eastern coast of tropical Pacific, which undermine the SST increasing in the eastern Pacific. In the control and
double CO2experiments，evolvements arc similar in the Nino events but different in the La Nina events. Compared with the control experiments，the La Nina events arc featured with more strongly cold SST，longer lasting span and
greater El Nino-Southern Oscillation circulation(ENSO) period in the double CO2 experiments. Here, the greater ENSO period can be interpreted by the“charge theory". From this theory, the exchange of the anomalous heat
content will be reduced between tropics and extrx-tropics with increasing CO2 in this model，which is apt to decelerate the charge rate of heat content in the tropics, therefore, the ENSO period will be prolonged.
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