Abstract: According to the fact that the current application state of tobacco pesticide of restrain-germinatin, intelligent spraying system on target was designed, which consists of bracket, speed sensor, tobacco stalk sensor, stepping motor, reel, electromagnetic valve, the slider, slippery course, one-way valve, nozzle, travel switch and SCM system, etc. Speed sensor can carry out real-time detection in response to the working speed of the unit, and SCM system controls the rotation speed and angle of stepping motor according to the detected unit working speed and magnetic valve starting time respectively. And SCM system also controls the magnetic valve opening and closing according to the presence or absence of the tobacco stalk signals. Indoor test showed the more slowly the test station moves(within 0.3-0.45 m/s ), the greater pesticide quantity (Qs≥15 ml)and the better pesticide effect. With the rise of pesticide pump pressure, pesticide collection will reduce slowly. The test result of model machine indicated intelligent aiming spraying system of tobacco pesticide of restrain-germinatin can work accurately and reliably and satisfy the application requirements.