Background: The main functions of most spraying UAVs in the market right now are flight, photography, security, and plant water spraying. Besides that, in the existing UAVs that can be used as operating platforms, most of them are mainly used in lifting, vertical throwing, vertical traction, and other operations. The horizontal operation to the ground is the main feature of these uses: The drone propeller is located directly above the entire operation platform, the only point to keep in mind is maintaining to avoid huge excursion accrues during the time of UAVs’ operating. The whole operation process and the operation stage will not have much impact on the flight of the UAV under the flight control system. However, excluding the mentioned applying, using sides of UAVs as our operation orientation is still needed. For example, Using UAVs to do wall surface cleaning, spraying of high above-ground walls, symbols painting, and UAVs’ horizontal shootings, etc. One feature of these applications is the ability of UAVs’ side operation. The accuracy and precision of these operations could easily be affected by the lateral retroactions being produced by UAVs themselves, which may eventually cause the continuity and safety of the following works. To limit the influences of retroactivity brought by UAVs themselves when operating work like spraying, the Chinese design of a spray painting robot was invented to address this problem.