The present disclosure discloses a method of using an unmanned aerial vehicle (UAV) comprising a housing (1), a processor, a positioning unit (5), a sonar unit (2), a launching unit (4) and a fishhook unit (3) 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 (2) to a predetermined height by the positioning unit (5), determining a coordinate corresponding to a signal detected by the sonar unit (2) as a fishing region when the signal is consistent with a predetermined value, launching bait to the fishing region by the launching unit (4), releasing a fishhook from the fishhook unit (3) 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.
