Introduction: The KS3390 is a large-capacity long-endurance electric hexacopter unmanned aerial vehicle. It is also equipped with a drop-off system on board, enabling quick loading and unloading. It is widely applied in transportation, emergency response, and rescue fields. The maximum take-off weight of the KS3390 is 260kg, and the maximum payload is 100kg. It is a significant aid for material transportation. Additionally, it can carry 100KG forest fire extinguishing bombs as a fire-fighting unmanned aerial vehicle to achieve forest fire suppression.