In practice, in automotive engineering analysis, vibration level of the human body and car seat are mainly determined by the on road vehicle testing or experiment of laboratory. This paper aims proposes a finite element simulation and vibration analysis technique of the car seat anh human model which will provide the level of oscillation in term of acceleration, displacement parameters of each part of the human body. Although there have been many simulation technologies to provide solutions related to the specific vibration of car seats, this new research method will take the simulation technology on the 3-D total model of the vehicle, seat and human body to a new level to evaluate the dynamic interaction between the model. Evaluating the values ​​of mode shape, natural oscillation can develop power spectrum analysis, resonance frequency and vibration transmission capacity will help predict the vibration data at different locations of the vehicle body, seat and each part of the human body. From there, it is possible to propose a complete solution for vibration research on the entire vehicle structure, seats and human body under actual operating conditions, which can replace experiments with costly and time-consuming costs.