The present disclosure discloses a method of using an unmanned aerial vehicle (UAV) comprising a housing, a processor, a positioning unit, a sonar unit, a launching unit and a fishhook unit in fishing. The method comprises manipulating the UAV to fly to a designated destination determined by the processor according to one of a received wireless communication and a preset program, adjusting the sonar unit to a predetermined height by the positioning unit, determining a coordinate corresponding to a signal detected by the sonar unit as a fishing region when the signal is consistent with a predetermined value, launching bait to the fishing region by the launching unit, releasing a fishhook from the fishhook unit to the fishing region, and manipulating the UAV to hover or return by the processor according to one of a received wireless communication and a preset program.
