This study was to explore the current situation and correlation between senior high school directors of student affairs' role perception and self-efficacy in northern Taiwan. Questionnaire was applied to survey 211 directors of student affairs in northern Taiwan. The findings showed that the overall role perception status of senior high school directors of student affairs tends to be medium to upper level as well as the overall self-efficacy tends to be medium to upper level. Senior high school directors of student affairs' role perception were significantly different in terms of gender, education level and school size. Senior high school directors of student affairs' self-efficacy were significantly different in terms of seniority of acting as a director of student affairs and school size. There is a positive correlation between role perception and self-efficacy for senior high school directors of student affairs. The role perception of the senior high school directors of student affairs has significantly influenced on self-efficacy. Moreover, principal assistant has a higher influence on self-efficacy.