It develop lowcost universal flight control system for the small drone (take-off weight beyond 100kg). The system is composed of flight control computer module, small IMU module, GPS module and LED indicator light etc. The inside of the system adopts dual-redundancy AHRS configuration which can cross-link the data link through the external interface and other sensors/mission equipment can be extended externally. The total weight of the system is less than 270g. This system is mainly aimed at industrial and security and protection, and can realize the stability augmentation control and full automatic flight of small helicopter, small fixed wing, small multi-rotor and small compound wing.