The invention provides a heat radiating method of a radiator for communication equipment. The heat radiating method at least includes an initial heat radiation step, a refrigerating step and a condensate water treatment step. In the initial radiation step, the radiator starts working and radiates heat transmitted by the communication equipment, a fan starts working and provides sufficient air flows to the radiator to form air convection around the radiator, and heat radiation of the radiator is accelerated. In the refrigerating step, a semi-conductor refrigerating piece works to reduce the temperature around the refrigerating surface thereof. In the condensate water treatment step, air-convection heat radiation of the refrigerating surface of the semi-conductor refrigerating piece is achieved by the air flows generated by the fan through flow guide wind tunnels so as to reduce condensate water generated by working of the semi-conductor refrigerating piece and accelerate evaporation of the condensate water. Through the initial heat radiation step, the refrigerating step and the condensate water treatment step, heat radiation efficiency of the radiator is improved, and the communication equipment is prevented from being influenced by the condensate water.