With the continuous development and maturity of Digital Radio Frequency Memory (DRFM) technology,active jamming to radar is more flexible and effective,so it is important to find a reliable and autonomous recognition algorithm for military applications.According to the general process of radar active jamming recognition,this paper summarizes the research results in recent years,and compares and analyzes the advantages and disadvantages of each algorithm.Firstly,the process and principle of jamming generation are illustrated by introducing the structure of DRFM.Then,17 kinds of common jamming are classified and the signal model is given according to the nature of the action,and the flow of jamming recognition algorithm is comprehensively sorted out based on the two core links of signal characteristics and classifier types.Taking two kinds of suppression jamming as an example,the influence of different characteristics and classifiers on the jamming recognition results is analyzed.Finally,the future development direction of radar active jamming recognition algorithm is predicted.