Abstract: Fuzzy PID control technology was applied to the spray volume control of sprayer sprayer，and corresponding control system was designed to improve effect of crop spraying.Firstly，the basic principle of crop spray control system was analyzed.Secondly，the software and hardware system of fuzzy PID control system，and fuzzy control logic table were designed.Finally，simulation of spray volume control was carried out.Simulation result showed that fuzzy PID control system could achieve better spray control effect and higher control accuracy.