Abstract:Different hydraulic servo control system would be obtained through changing load based on cylinder controlled by servo valve.Load pressure-flux characteristics of asmmetrical cylinder controlled by servo-valve was analyzed. Flux continuity equation of cylinder controlled by servo valve and the balance equation of hydraulic cylinder were pat fprward

The dynamic characteristics mathematics model for position control system in cylinder controlled by servo-valve was deduced .SIMULINK module of MATLAB language software was used to carry through dynamic characteristics simulation analysis for position control system in cylinder controlled by servo-valve.The results were validated through experiment，and showed that mathemati model and simulation results were closed to practice work situation

and could satisfy analysis needs to different hydraulic servo control system load characteristics