Whereas the mode result is sensitive to the input signal, the influence of the measure information on the operational mode identification of the aircraft is investigated. The theory of the auto-regressive and moving average (ARMA)-natural excitation technique (NExT) method is introduced, and the strategy of experiment is put forward, which includes the measuring points distributing and the excitation method. Several measuring points distributing cases are put forward, where the influence of the measure information on the operational mode identification is studied, and the influence of the data accuracy on the operational mode identification is investigated. It is found that the mode identification result is better when the measuring points is abundant and locate at the bigger value of the modal shapes.