A temperature equalization system, including an installation, a heat equalizer disposed in a natural heat carrier and being made of a material of heat conduction to exchange heat with the natural heat carrier, a fluid transmission duct disposed between the heat equalizer and the installation and having a fluid contained therein for heat transmission, a pump connected in series with the fluid transmission duct for pumping the fluid, and a control means controlling an operation of temperature equalization system. The control means controls the pump to pump the fluid through the fluid transmission duct and an interior of the installation with a periodical change of flowing direction.