Considering the influence of car seat adjustment parameters on body pressure distribution， three parameters of seat back angle， seat height， and the seat fore-aft position were selected as factors. The orthogonal test of three factors and five levels was designed， and the collection experiment of body pressure distribution of 95th percentile， 50th percentile human and H-Point Machine（HPM） under different adjustment parameters was carried out. Firstly， the collected body pressure data weredenoised and extracted from the body pressure index， and gray correlation analysis was used to analyzethe factors with a large correlation with body pressure distribution index. Then single-factor experiments were performed on factors with a large correlation with the body pressure index， describing the change of each body pressure index under the dynamic adjustment of a single factor. The results show that seat back angle and the seat fore-aft position have a great influence on the body pressure distribution. When the back angle increases， the backrest body pressure index of different percentile human increases， and the overall body pressure index of the cushion becomes slightly smaller. When the position of the seat fore-aft increases， the 95 th percentile human backrest body pressure index decreases and the cushion contact area decreases， while the 50 th percentile human backrest body pressure index changes little and the cushion contact area decreases.