Abstract: This paper introduces the latest developments about flight tests of the vertical-fin buffeting from domestic and overseas.Deduces and analyses theoretically on the flight test meth-od for buffeting flight test are done.In domestic,the analysis of buffeting mostly focuses on the-oretical derivation and wind tunnel test up to now.But in actually flight,the result usually has some difference with theoretical derivation and wind tunnel test.In order to find the variation of buffeting in flight test,six acceleration-sensors on the vertical-fin are installed,including tip of leading edge,middle of leading edge and tip of trailing edge both in left and right vertical-fin.In flight test,wind-up-turn flight method is used at pressure altitude of 10000 meters,Mach from 0.65 to 0.95.From the test,the buffeting response of the vertical-fin in different Mach numbers is got.Then by the analytical method of root-mean-square (RMS),time-frequency analyses and power-spectrum-density (PSD),establishing the relation between buffeting response and either angle of attack (AOA)or frequency,given the initial angle of attack at different Mach numbers, we can find that the buffeting response is in accord with the variation in strouhal equation.The response mainly is in low-order model frequency of the vertical-fin,and this key frequency chan-ges with flight state and measuring position.The vertical-fin buffeting response increases with the increase of both the angle of attack and Mach number,and the angle of attack influences more.After plane exceeds initial buffeting angle of attack in flight,the buffeting response of the after edge in the tip of the vertical-fin is significantly greater than that of the leading edge with the increase of the angle of attack.