Electrohydraulic servo system has been widely used in industrial control area because of the advantages of rapid response and flexible control. Modeling, identification and control of the system have been a research hotspot in recent years. The modelling of system and identification methods were compared, the electrohydraulic servo system was a genius nonlinear system, and there were dead zone, saturated, friction, backlash, and pressureflow gain nonlinear factors, et al. It was demonstrated that linear modelling got low accuracy, there were unmolded characteristics in theoretic nonlinear model, and high accuracy model could be gotten by using nonlinear model identification method. Study of realtime online identification algorithm, and apply it to the servo control, is the way of striving for future. The advanced control methods of electrohydraulic servo system in recent years are summarized, which provides strong guidance for theoretical study and practice application.