Pre-wing plays an important role in emergency handling,especially in urban areas with high population density like Beijing.Knowing the information dissemination mechanisms clearly could help us reduce losses and ensure the safety of human beings during emergencies.In this paper,we propose the models of pre-wing information dissemination via five classical media based on actual pre-wing issue processes,including television,radio,short message service (SMS),electronic screens,and online social networks.The population coverage ability and dissemination efficiency at different issue time of these five issue channels are analyzed by simulation methods,and their advantages and disadvantages are compared by radar graphs.Results show that SMS is the most appropriate way to issue long-term pre-waming for its large population coverage,but it is not suitable for issuing urgent wings to large population because of the limitation of telecom company’s issue ability.TV shows the best performance to combine the dissemination speed and range,and the performance of radio and electronic screens are not as satisfactory as the others.In addition,online social networks might become one of the most promising communication method for its potential in further diffusion.These models and results could help us make pre-wing issue plans and provide guidance for future construction of information diffusion systems,thus reducing injuries,deaths,and other losses under different emergencies.