Abstract: A real-time signal sorting system and an improved sorting algorithm based on the probability statistics is introduced. It is for the special radar signal environment of high pulse-density and high pulse-losing probability in electronic warfsre. The feasibility of this sorting system and algorithm is verified through lots of experiments. By designing the hardware circuits, the signal sorting system is realized. It performs well for duplex requirement of high-accuracy and real-time processing in high pulse-density environment.