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Rainfall rate from tropical cyclones has been projected to increase in a warmer climate. Changes in rainfall rate and area coverage are both important to the impact oftropical cyclones on human lives. Yet, little is known about how tropical cyclone rainfall area will change in the future. By using large amount of satellite data andglobal atmospheric model simulations, show that rainfall area of tropical cyclonesis primarily controlled by sea surface temperature in the local tropical cyclone environment relative to the tropical mean sea surface temperature, or the relative seasurface temperature, while rainfall rate increases with the absolute sea surface temperature. Therefore, tropical cyclone rainfall area in a warmer climate is expectedto change little if sea surface temperature change is relatively uniform, and theincreased amount of tropical cyclone rainfall will be confined in the same size domains with large increase in rainfall rate.