Abstract: To improve the safety of human-computer interaction in the driving process of combine harvester, the performance shaping factor（PSF）of combine harvester driver was studied. The PSF system was constructed based on literature analysis and experts judgment. The intuitionistic score set of PSF was got based on trapezoidal intuitionistic fuzzy number and decision making trial and evaluation laboratory method, the intuitionistic relationship fuzzy influence matrix was constructed by transforming linguistic variable into ITFN, the center degree and reasoning degree of the VDT PSF were clarified by clarifying the comprehensive relationship fuzzy influence matrix and the key factors were put forward. Finally, the sensitivity analysis was carried out. The results showed that the PSF model was effective and could correctly describe the causal relationship between PSFS. The comprehensive impact level among 19 PSFS was 2.87, and the mean centrality was 5.75. The centrality of 11 factors, such as attitude, skill, experience, display mode, display interface layout, control device layout, forward vision, safety education, operation supervision, operation procedures, and supervision agency, was greater than the mean or the cause degree was higher than 0.