Abstract: UAV as a product of modern technology, can work in high-risk area and has been widely used. The risk of UAV rocketpropelled launch process is analysised. The launching is processed by the subprocessing method, and the mathematical model of each flight segment is established. An example analysis result is given to determine the safe area of launching. The result is used to provide a theoretical basis to the UAV launching. and can satisfied to engineering need of the UAV launching location. This method not only can be used to determine the launching security zone, but also has project reference to the launch security analysis for other UAVs.

Key words: UAV, Mathematical model, Rocket-propelled launch