Blast furnace slag is a solid waste generated during the ironmaking process of blast furnaces. With the rapid development of China's economy, the amount of slag accumulation has been increasing year by year, not only occupying a large amount of land resources, but also facing problems such as resource waste and environmental pollution. Therefore, it is particularly important to achieve the reduction and resource utilization of blast furnace slag. The properties and treatment process of blast furnace slag are introduced, and the current situation of comprehensive utilization of blast furnace slag is summarized, The concept of potential application of blast furnace slag in flame retardancy has been proposed, which is expected to open up new ideas for the high value-added utilization of blast furnace slag