In order to make electro-hydraulic proportion throttle control can adjust to varying load and modify mouth size, design the fuzzy principle to adjust PID controller parameter. Carry out dead-time compensation for electro-hydraulic proportion valve, use finding fuzzy principle rule method and adopt history data to calculate the cylinder speed and acceleration to modify Kp, Ki, and Kd parameters. Compare it with traditional PID method. The result show that the fuzzy PID controller is less affected by the load than the traditional PID controller, and the control effect is improved. It has stronger robustness, shorter regulation time, and faster step response.