Hydraulic servo valve has the advantages of fast response speed,its performance directly affect the overall performance of the equipment.In order to ensure the quality of the servo valve and the normal operation of the equipment,a set of servo valve performance test system based on virtual instrument was designed.The system was used to test the performance parameters of servo valve.The results show that compared with the traditional servo valve performance test system based on VB/CAT,the designed system has the advantages of simple equipment composition,simple programming,high test accuracy and good response,by which the main performance test of the servo valve test can be reliably completed and the safe operation of the equipment can be ensured.