Aiming at the insufficient of the theory and application of advanced control algorithm for the valve controlled cylinder system,the applications of various control algorithms in hydraulic system control of valve controlled symmetric cylinder were studied.The nonlinear differential equation of valve controlled symmetric cylinder was deduced,and the dynamic performance of servo valve was considered as a first-order system question;the theoretical derivations of PID,pole assignment and adaptive controller based on back stepping were carried out;a power bond graph theoretical model of the valve control symmetric cylinder was established,and the control effects were simulated by using the above control algorithms.The results show that the adaptive controller based on the back stepping has a standardized design method and wide adaptability,and its control effect and application value are greater than the traditional control scheme.