The invention relates to an unmanned aerial vehicle, a controlling system and method for the unmanned aerial vehicle and a controlling method for landing of the unmanned aerial vehicle. The unmanned aerial vehicle comprises a vehicle body, a power device, a controlling device and a taking-off and landing device, the power device is connected to the vehicle body, and the controlling device and thetaking-off and landing device are arranged on the vehicle body; the power device and the taking-off and landing device are electrically connected with the controlling device; the controlling device comprises a landing face detecting assembly and is used for controlling working modes of the power device and the taking-off and landing device when the fact that the landing destination of the unmannedaerial vehicle is a water face is detected by the landing face detecting assembly so that the unmanned aerial vehicle can land and navigate on the water face. The unmanned aerial vehicle can fly in the sky and can also navigate in water.