The impact of military activities and other special events on flight can easily trigger a large area of airspace congestion, flight conflict, flight delay and other issues, and induce huge social and economic losses, which in turn seriously affects the efficiency and quality of military training. In view of the urgent need to improve the utilization rate of airspace resources, the important strategy to alleviate the shortage of airspace resourcesdiversion path planning is reviewed systematically from four aspects of influencing factors of diversion path planning, flight restricted zoning, rerouting path planning model and optimization solution method. the development history, research progress and the advantages and disadvantages of the existing methods and strategies are also discussed, and it looks forward to the future development direction of centralized and unified coordination and management, nonindependent multiflight route planning, dynamic planning under uncertain conditions and intelligent route planning, so as to provide systematic support for improving the utilization rate of airspace resources.