The ST800 UAV mainly consists of carbon fiber composite materials, matching joints of aluminum alloy to ensure the strength of body as well as to effectively reduce the weight. The six arms are with 18mm carbon fiber tubes and enhanced motor mount. The connections of landing gear are formed with 14mm carbon fiber tube, which is composed with metal and carbon fiber, to be assembled and repaired easily. Supporting tubes are made from 12mm carbon fiber tube, the span between tubes is 155mm, it accommodates with mainstream camera gimbal in the market. There are two extended boards in front and rear of the fuselage, it is convenient for the installation of GPS, receivers and other equipments. Battery frame is fixed by metal connectors, the hexacopter of gravity of the aircraft can be adjusted by sliding the battery fram