This paper established mathematical model based on control theory for electro-hydraulic position servo system, used Simulink to simulate system model, and applied M files and module mask function to simplify the system simulation process. This electro-hydraulic position servo system adopted PID controller. The PID control is the abbreviation of proportion, integral and differential control, its value depends on its widely applicable for most of the control system, especially when the mathematical model of the controlled object is known, PID control could be particularly useful. This paper applied digital PID to get ideal system dynamic performance by adjusting the PID parameters. This paper proposed a method that provides a reference for other control systems analysis and design.

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