Abstract: An UAV landing system includes an UAV and a target area. The target area includes a first reference area of a first color. An image below the UAV is captured to generate a reference image. The reference image includes at least two reference points located in a surrounding area of the reference image. A processor of the UAV determines whether the colors of the at least two reference points are all the first color. If the determined result is yes, the processor controls a controller of UAV to drive the UAV to move downward toward the target area. If the determined result is no, the processor determines whether the at least two reference points include the reference point of the first color. If the determined result is yes, the processor controls the controller to drive the UAV to fly along a flight adjustment direction.