Abstract: In this paper, for the traditional single-function radar equipment in the complex electromagnetic environment is easy to expose itself, easy to be interfered with and there is electromagnetic pollution and other weaknesses, combined with the characteristics of the software radio, put forward a multi-functional integrated radar system based on the software radio detection and investigation. Under the control of the host computer, the system can realize a multi-functional integrated radar system with active detection, passive reconnaissance, active detection + passive reconnaissance in three modes of operation, radar data acquisition and signal processing and other functions. This paper introduces the system design framework, system function design and upper computer interface, and gives the timing simulation and function test results under three modes of active detection, passive reconnaissance, active detection + passive reconnaissance. The test results show that the system can realize data acquisition in multiple modes, switch from active detection tasks to passive reconnaissance tasks within 59 us, has strong real-time performance, the system data transmission rate can reach 9.3 Gbps, and it can realize the function of multi-purpose to meet the demand of multi-mode reconnaissance target of the radar system under the modern complex electromagnetic environment.