Abstract: To solve the control problem of micro-flow or low flow on pesticide in the course of variable rate spraying, an electromechanical flow control valve was developed with a miniature pin valve, a direct current(DC) motor, and gearset. A mathematical model of transfer function and arithmetic of fuzzy control were designed for the valve. The MATLAB simulation of the fuzzy controller and a PID controller was carried out on the electromechanical flow control valve. The results show that the fuzzy control is prior to PID control in the response speed and overshoot on this valve. Steady state errors are both within ±3%.