Electro-Hydrostatic Actuators (EHA) are commonly used in aircraft due to their exceptional advantages, including their compact size, high energy efficiency, and remarkable reliability. However, given that EHAs encompass electrical, hydraulic, and mechanical components, their control performance is intricately linked to external disturbances. To tackle this challenge, this paper proposes an active disturbance rejection control method for EHAs. In this method, a transfer function model for EHA is established and a Linear Active Disturbance Rejection Controller (LADRC) is introduced into the position loop of a three-loop PID controller. This integration effectively addresses the control accuracy degradation caused by disturbances. Dynamic simulation results in the Matlab Simulink environment show that LADRC is more effective at suppressing disturbances compared to traditional PID control methods, significantly improving control performance.