The active disturbance rejection control technique is applied to solve the delay compensation problem of the networked brushless DC motor speed control system. Firstly, an uncertain system model is presented to describe the DC motor control system with time-varying network induced delay, where the dynamics induced by the uncertain part of the delay is described by the model uncertainties. Then, an extended state observer(ESO) is designed to estimate the uncertainty of the motor speed control system model. Finally, an example is presented to show the effectiveness and superiority of the proposed active disturbance control method.