The fighter adopts double closed-loop control of angular rate and angle of attack. The outer loop controls the angular rate and the inner loop controls the angle of attack to greatly improve the directivity and maneuverability of the aircraft. A new flight controller is adopted, which is rewritten based on the original PID control, and I limit is introduced. The aircraft has completed racing and air combat tests. The test shows that the new generation of flight controller greatly improves the control characteristics, ensures flight safety, and can be simply modified in case of serious stall. The maximum circling speed of the aircraft is 55 deg° / s, the maximum overload is more than 20g, and the maximum AOA can be more than 23 deg°.