Purpose: In this study, we examined the differences and relationship between teaching style of preceptors, and personality, nursing performance, and organizational socialization of new nurses. Methods: The participants were 118 new nurses. The data collected from March to May 2011 were analyzed using descriptive statistics, ANOVA, and Pearson correlation coefficients. Results: Teaching style of preceptors was most frequently judgement-initiative, and personality of new nurses was most frequently extraversion. Nursing performance ($3.05{pm}.59$) and organizational socialization ($3.05{pm}.59$) of new nurses were at an average level. Nursing performance and organizational socialization of new nurses were not significantly different according to teaching style of preceptors. Significant correlations were found between personality and nursing performance, and between personality and organizational socialization. Conclusion: These findings indicate that changes in perceived teaching style of preceptors and personality of new nurses may be necessary to increase efficiency of preceptorship related to nursing performance and organizational socialization of new nurses. The above-mentioned results should be reflected in the development of effective preceptor training programs.