A decomposition solving model for multi-UAV cooperative reconnaissance with defense radar monitoring is built to realize the path optimization of multi-UAV cooperative reconnaissance. Firstly, the target of investigation is divided by clustering analysis, secondly, the TSP algorithm is used to find the optimal detection path between each target point in the target group and assign the task to the UAV. Then, according to related constraint conditions, the MMTSP optimal model which goal is that the least sum of time about UAV trapped in enemy radar reconnaissance area is built. Finally, by solution of the model through ant colony algorithm and the example analysis is made. The illustration results show that the model and method is feasible and effective, and it provides reference for multi-UAV cooperative reconnaissance.