Firstly， a calculation model is established for aeroacoustic analysis of main-rotor/tail-rotor interaction. In the established calculation model， a CFD model based on the motional embedded grid system is adopted to simulate the aerodynamic interaction flow-field of helicopter main-rotor/tail-rotor configuration， and FW-H equations are used to calculate the interaction noise of tail-rotor. Secondly， based on the developed calculation model， the tail-rotor noise characteristics under the main-rotor interaction in different flight conditions are calculated in detail， and the influence of the rotor wake on the tail-rotor noise is analyzed. In addition， the influence of design parameters of tail-rotor （i.e. rotation direction and vertical position relative to the rotor plane） on the tail-rotor noise is studied seriously. The calculation results indicate that in hover， the noise level of tail rotor increase slightly due to the interaction of main rotor wake， but no significant changes of noise occur. At forward flight， the noise level of tail rotor is influenced by the main rotor wake obviously， and rotation direction and vertical position of the tail-rotor have important influence on the acoustic characteristics of tail rotor.