When the single-threaded operating mode of the existing radar simulation system is used to process a large amount of data or execute multiple tasks, it will increase the burden of the CPU, result in slow system operation and data loss, and affect the effectiveness of the simulation test.To solve the problems, a radar signal system is proposed based on the GNU Radio software platform by using its multi-threading technology and modular ideas, and the method of transmitting memory addresses is designed and used to establish the radar signal system, and improve the resource utilization of the computer.System operation in multi-threaded mode can not only process a large amount of data, but also increase the speed of data processing.The final test data shows the effectiveness of the radar signal processing system, which achieves the expected design goals, and meets the actual application requirements.