Abstract: In order to meet the need of MSIV solenoid valves performance test in PWR nuclear power plants (NPPs), the integrated performance test system for solenoid valve opening-closing characteristics and sealing performance is developed. This paper introduces the principle and composition of the system. The system can effectively detect the overall performance of MSIV solenoid valves, and then guide the follow-up maintenance work, effectively avoiding human error, and can be used as an important maintenance tool for MSIV solenoid valves.