Because of the outstanding advantages of multiple UAVs in carrying out reconnaissance missions,it is of great significance to study the assignment method of the reconnaissance missions.Firstly,the classical models are introduced and classified,and their characteristics and applicability are discussed.Secondly,the centralized,distributed and mixed solution methods are summarized,the representative algorithm is introduced,and analysis is made on its advantages,disadvantages and application prospects.Finally,the shortcomings of the current multi-UAV reconnaissance task assignment methods in modeling,dynamic task assignment,uncertain task assignment,confrontational task assignment and large-scale task assignment are pointed out,and the future research directions are given.