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In order to reduce the test time of the electro-hydraulic steering engine, reduce the damage to the steering engine and improve the test efficiency and precision, it was designed a test system that contain mechanical, hydraulic, electrical and computer based on virtual Instrument. The hardware was composed by industrial computer, PCI board, communication bus, pump station, PLC and electrical control cabinet. The software is designed in LabWindows/CVI platform. RTX real-time system, multi-thread processing and TDMS and other core processing methods was used in test system. With this system, performance of the electro-hydraulic steering engine’s was tested automated. The application showed that the system run steadily with high system precision.