Abstract According to the ISO2631 standard and GJB966-90 standard, Plane-seat-human vibration model is established to evaluate seat comfort characteristic. By analyzing the test data of some bombing plane, vibrations coming from the ground through the undercarriages before the airplane takes off are different from that after the airplane takes off, additional gust and maneuvering quality can bring low frequent vibrations by changing airplane attitude: flight height and pitch angle,etc. The bombing plane comfort characteristic should be improved.