Abstract: The comfort of aviation seat has an important influence on the passenger′s comfort. In this paper, aiming at the occupant comfort problem of a certain type of civil aviation seat, a seat dynamic model is established, then the human body model is introduced. Through the human posture adjustment, the seating process of occupant is studied, and the pressure distribution of the seat cushion and the back in the process is also analyzed. According to the Mergl-SAE2005 criteria, the comfort performance of the seat is evaluated, and the simulation results are compared. The results show that the body pressure distribution between the seat and the occupant is simulated more accurately. The research of the paper has certain reference value for the comfort evaluation of aviation seats.