Abstract: According to the characteristics images of trees, the towardtarget technology was applied in the truckmounted high range sprayer. The lowspeed cruising system and spray control system were designed. The image processing, spray control and fit with the walking pace were realized. The results showed that the system could fit the lowspeed cruising speed driving. Spray control could correctly obtain the PC control commands. The automatic control of truckmounted towardtarget sprayer was realized.