A dynamic simulation method for passenger seat in transport category airplane is introduced. A combination of transient finite element/multibody software and Hybrid III ATD occupant model which is modified by SAE 1999-01-1609 is used in this method. The evaluation principle of the simulation model and the key elements and validation criteria in the simulation analysis are described. By using computer model to predict accurately the result of the physical experiment, the recommend practice method is presented to the engineering analyst in order to save resource of passenger seat development.