This study examined the mediating effect of career decision self-efficacy on the relationship between the Five-Factor Model of personality and the career commitment process (i.e., vocational commitment and the tendency to foreclose) in a sample of 785 Chinese graduate students. The multiple regression analyses showed that neuroticism and conscientiousness related significantly to progress in vocational commitment both directly and indirectly through career decision self-efficacy. High agreeableness related to less premature foreclosure. In addition, career decision self-efficacy associated with greater progress in vocational commitment but also a strong tendency to foreclose. The implications for career development theory and practice are discussed. (Contains 3 tables.)