Abstract: The simulation results of the 6 climate coupled models of CMIP5 under the secondary emission scenarion RCP4.5 (Representative Concentration Pathway 4.5) are used to estimate the changes of the extratropical cyclone (EC) numbers and EC intensity, as well as the storm track and its strength in the future. The results indicate that: (1) although each model differs in the simulations of the regional cyclogenesis during 2053—2100 under RCP4.5 relative to the second half of the 20th century, it is similarly found that ECs would decrease integrally in the Northern Hemisphere, especially in the lower latitudes. (2) The central pressure of ECs over the Northern Hemisphere would depress and the vorticity intensity would weaken in the future reproduced by models consistently. The simulated Atlantic storm track would move polewards sequentially but with weakened strength as are shown by most of the models in the future; the simulated Pacific storm track would also migrate polewards by more than half the models, but with intensity changes differing in the different seasons. And, (3) a poleward movement of the future baroclinic zone in the middle-upper troposphere is detected in all the 6 models, and this change in the Southern Hemisphere would be more significant. The changes of the baroclinic zone reflect the similar changes of storm track to some extent, which supports for the conclusion of possible poleward shift of the two storm tracks. That could be a significant reduction in EC activities over the Northern Hemisphere under RCP4.5, while the poleward movements of baroclinic zone and storm path would cause more remarkable reduction of EC activities over the lower latitudes in the future.