Abstract: In order to enhance survivability of fighter,this paper researched the problem of offense-defense confrontation of fighter and medium-range ground-to-air missile when fighter flies normally,maneuvers,or launches decoy missile.First,the mathematical model was established,and then the cases of combat engagement were simulated based on Visual C++ and Matlab.The result shows that maneuver or launching decoy can enhance survivability,but the result is different remarkably with different maneuver manners in different situations.Snake maneuver is the best.