The type of military UAV route planning has a close relationship with combat tasks, and the fixed route-planning methods are commonly used for long-distance reconnaissance tasks. Firstly, in order to quantitatively analyze the advantages and disadvantages of the quality of fixed route planning and detect the restraining factors of the route quality enhancement, the evaluation index and calculation model of the route quality are built, whose main parts are the completion of tasks, air safety and the perforance of the functions. Then, a new fixed route-planning method is proposed taking the loop route planning as an example. The battle dividing line is taken as the reference for route creating, including the three stages of route approaching, forward exploration and backward optimizing. Three kinds of results of route planning are obtained, i. e. , conventional route, radical route and conservative route, which could satisfy the needs for different battle backgrounds and tasks. The application of it in the operational simulation system has proved the effectiveness of the route planning method, and the quality evaluation of the route planning can clearly reflect the advantages and disadvantages of the routes, which can be used as a reference for the decision-making of the commander.