The existing study aimed to analyze the effect of the four temperaments on individual innovativeness and satisfaction with life perceptions.In this study, library and field were used for data collection. First, the problem and area were fully introduced through library studies. Then the questionnaires were distributed among the sample members, and the relevant data were collected in the field section. The sample size in this study covered 3410 employees of Bank Melli Iran. The structural equation technique was used to check the hypotheses. The findings show that the diversity of the four temperaments significantly affects employees' satisfaction with life perceptions. The effects of phlegmatic, melancholic, and sanguine temperaments were positive, and the effect of choleric temperament was negative. The individuals with phlegmatic temperament had the most satisfaction, and those with choleric temperament had the least satisfaction with life perceptions. In addition, the significant relationship between the four temperaments and individual innovativeness was confirmed. The effect of sanguine, phlegmatic, and melancholic temperaments on individual innovativeness was positive, while the effect of choleric temperament was negative. In other words, the individuals with sanguine temperament had the most individual innovativeness, while those with choleric temperament had the least individual innovativeness.