Now radar reconnaissance equipment plays a more and more important role in electronic warfare. With the development of recent years, the study of the core part of radar signal sorting algorithm have made great progress. This paper briefly introduces the current research status of radar signal sorting algorithm, illustrates the development of the parameters sorting algorithm based on pulse description word (PDW), then points out the application of clustering analysis in radar signal pre-sorting, and put forward an improved adaptive clustering sorting method. In the final this paper analysis blind source separation(BSS) algorithm, explains its important role in radar signal sorting.