Abstract: The hydraulic systems of new deployed equipment are complicated and practical equipment training has the potential risks of breakdown and safety. To solve these problems, an experiment training stand is developed based on the semi-real hydraulic system and virtual models. The 3D modeling software and Unity3D are used to model the system and integrate and control the animations. The designed interface module includes the data acquisition and control card based on the core chip STM32F407IGT6, the operation control unit and the sensors, which realizes the data transformation between the semi-real system and virtual model. Taking one type of integrated gearbox hydraulic system as example, different training functions of this stand, such as constructing principles and fault diagnosis, are fulfilled and illustrated. The application shows that by using the experiment training stand based on HIL, the theory and practical training are integrated deeply, and the problems of the complicated hydraulic systems training such as obscure construction and principle and insufficient practical training are solved effectively.