Radon gas is the only radioactive inert gas, whose hazards for human have been confirmed by medical and health science. The WHO report revealed that the inhalation of radon and its decay products was carcinogenic for the human lungs among nonsmokers. Approximate 3%~15% human lung cancers are triggered by the radon gas among different countries all over the world. The synergistic effect of radon gas and smoke will significantly raise the possibility of lung cancer. In addition, excess radon inhalation will damage human nervous system, decrease the hemameba, and trigger the increasing of blood clotting and hyperglycemia. Radon is the decay product of 238U, whose one main source is the granite. Granite is the main constituent of continental crust of the Earth, occupying the 22% on volume. Lots of studies on granite origin have been implemented among geological community, however, the relationship of human lung cancer and the granite hasnt got enough attentions from geologists. In contrast, the medical and health community know much about the radon gas, but they dont understand the original source of radon gas and its closeness with granite. In the present study, we would like to address the linkage between granite and radon, shed light on the damage of radon gas for public.