In order to test the performance of hydraulic components of electro-hydraulic servo system, a comprehensive electro hydraulic control test bed and test system were designed and manufactured for the needs of the changes of large flow and the detection of high accuracy in hydraulic system. The static and dynamic performances of the serve valve and other hydraulic components can be tested by the test bed. By the field test trials, the test bed can meet the needs of the hydraulic system test in the engineering and scientific research with its own stable performance and high accuracy.