Abstract: A flow control valve based on electromechanical method and a flow control system was designed for farm chemical flow control at vehicular variable sprayer according to the requirements of real-time mixing pesticide variable spray. Employing fuzzy control algorithm and relied on STC12C5410AD MCU, the fuzzy controller for farm chemical flow was implemented. Static tracking testing and dynamic response testing were carried out for designed system. The static tracking error was ±3.0%; dynamic response state error was ±3.2%, and response time was about 0.35s when the initial value was 1.5 mL/s and final value was 3.1 mL/s. The results of measurement and test show that fuzzy controller has good control performance on this flow valve; over-shoot, response time and steady state error are all to achieve control requirements.