Abstract: The paper aims to improve the efficiency of disaster information transmission in decision-making in disaster prevention and mitigation. The authors constructed a basic framework of information communication mechanism for catastrophic weather, using method of information flow and modular structure. This mechanism reflects four characteristics such as technology, simplification, intensification and integration. In actual operation, those modules such as monitoring and warning module, decision support module, emergency module, coordinated public relations module, and information processing module are well designed, clearly targeted, consistent with the rights and duties, and easy to operate.