Abstract: Based on the research of the electro-hydraulic steering system of crane, the mathematical model of the electro-hydraulic proportion control for a hydrocylinder was developed. The PID strategy was applied to control the location of the hydrocylinder. For solving the difficulty of PID control parameters adjusting, the combination of fuzzy control and PID control was employed to conduct on-line adjustment of PID parameters. The model of the control system including fuzzy control was established with SIMULINK module of MATLAB. The results of simulation show that the fuzzy PID control improves the dynamic characteristic of the system, enhances the practicability.