In order to explore how to evaluate the high attack(AOA) flying qualities before stall AOA,through pushing stick and changmg posture angle by 10°, to roll from bank to bank and to capture 90° roll angle and air to alr tracking are chosen as a subset to study flying qualities at high angle of attak. Secondly,flying qualities of a third generatlOn fighter are evaluated with a slmulator. At last. the results of simulationevaluatlOn are compared with ones derived from equivalent system method. The conclusion is that if the boundary of flying qualities are adjusted suitably , the high AOA flying qualities can still be evaluated by equivalent system method. although the boundary of high AOA flying qualities is different from small AOA ones.