Because the electrohydraulic servo valve has poor antipollution ability,easy to break down and difficult to judge,and needs frequent maintenance,a static performance test bench for electrohydraulic servo valve was developed to facilitate its performance test.In the testbed,the pressure of hydraulic oil source was controlled by proportional relief valve.The measurement and control system used precise pressure sensor and flow sensor to collect signals.The industrial computer and programmable controller were combined to transmit signals.The test software was developed based on KingView.The test system has the advantages of short development cycle,good humancomputer interaction and strong practicability.The feasibility and rationality of the test system are verified by the actual performance test of the electrohydraulic servo valve.