The study objective is to investigate the impact and mechanism of intrinsic positive factorssuch as optimistic temperament, hopeful traits, and attribution types on career decision-making selfefficacy.A survey was conducted on 248 doctoral, master’s, and undergraduate students in a certain levelof discipline using a life orientation test, adult hope scale, attribution style questionnaire, and careerdecision-making self-efficacy scale. Result: There is a significant positive correlation between optimistictemperament and career decision-making self-efficacy; There is a significant positive correlation betweenhope traits and career decision-making self-efficacy; The mediating effect of optimistic temperamentand hopeful traits on career decision-making self-efficacy; There is no correlation between attributiontypes and career decision-making self-efficacy. There is a significant correlation between optimistictemperament and hopeful traits in positive psychological factors and career decision-making self-efficacy,and they mediate each other in career decision-making self-efficacy.