This study investigates the relationship among school culture and students' conscientiousness, and also analyzes the moderated effect of socialization tactics. The college and military students were selected as target sample. Total of 386 usable questionnaires were analyzed. Four findings were found: 1. Free open culture is negatively related to students' conscientiousness. 2. Traditional ethics culture is positively related to students' conscientiousness. 3. There had a less negative relationship between free open culture and students' conscientiousness as institutionalized socialization tactics. 4. There had a more positive relationship between traditional ethics culture and students' conscientiousness as institutionalized socialization tactics. Implications for managerial practice on the findings of this study were discussed.