A test system was developed for the performance test of the nozzle baffle type electrohydraulic servo valve. Data acquisition was used PCI6221 data acquisition card, the 16 channel AD card was used as data acquisition board for data acquisition and curve output. The static and dynamic performance of the valve could be tested. The test results and theoretical data were compared. The results verify the reasonableness and accuracy of the test bench, that can be used to test the dynamic and static performance of electro hydraulic servo valve and to make experimental study of electro hydraulic servo system.