This system is used to re-inspect the electro-hydraulic servo valves that have left the factory, to ensure that the servo valves installed on military products meet the requirements. This platform detects the static and dynamic characteristics of the electro-hydraulic servo valves, and the detection accuracy reaches the national Class C test bench standard. Static characteristics include no-load flow, static flow and pressure gain; dynamic characteristics include amplitude frequency and phase frequency characteristics. Solution : (1) Hardware composition: The system uses Advantech IPC-610 industrial control chassis, and is equipped with one PCL-1800, one PCL-812PG and one PCL-726 card. PCL-1800 is used for analog output, which is connected to the servo method through an external power amplifier to control the current frequency and amplitude of the electro-hydraulic servo valve. PCL-812PG detects the flow, pressure and temperature of the servo valve by collecting signals from various sensors; and detects the flow and displacement of the dynamic cylinder in the dynamic characteristic test. PCL-726 is used to control the opening and closing of the throttle valve. (2) Software composition: The system software is programmed using VEE. The hardware is controlled by calling the board driver through the self-compiled dynamic link library. (3) Test process and conclusion: During the acceptance process, the three digital acquisition cards were verified by standard instruments and all met the rated accuracy. In the static characteristic test, the system test accuracy reached 2.5%; in the dynamic characteristic test, the input and output signals of the system under test were sampled simultaneously by PCL-812PG to calculate the amplitude ratio and phase difference of the two signals. When the sampling frequency was 30 times that of the signal under test, the phase difference of the same signal was about 5 degrees at different frequencies, indicating that there was an error due to the synchronous sampling of a single A/D converter by PCL-812PG, but the error was relatively stable.