LY-820 Four-rotor unmanned aerial vehicle(UAV)system, is one Minitype UAV which can be quickly dismounted. Its fuselage structure is made of 100% carbon filer material. Rack,upper cover, supporting arm, landing gear,motor bracket,etc.are all light-weight structure design,among which four arms adopt plug-in structure,fast storage and portable,small storage size as well as easy to transport,The system's take-off load weight is less than 12kg,with largest overall dimension less than 1800mm.It only takes a few minutes to unfold its fuselage,also only a few moments to wait GPS satellite positioning once power-on,which is actually one small UAV operation aircraft with wide range of applications,and can be widely used in film aerial photography, aerial reconnaissance, anti-terrorism, evidence collection, geological survey, remote sensing mapping, communications relay, environmental protection,meteorological exploration, disaster monitoring, aerial surveying, public fire security, and other industries as well as fields.