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Objectives: The objective of this study is to analyze the relationship among self-esteem, optimism, and smart phone addiction of middle school students and examine the variables on smart phone addiction. Methods: Data were collected by questionnaires from 475 middle school students in U city. To analyze the sample survey data, descriptive statistics, t-test, ANOVA, duncan test and multiple regression analysis were performed with SPSS/WIN 15.0. Results: There were statistically significant differences among general characteristics sex, grade, school record, satisfaction with school life, economic state, romantic relationship, the period of smart phone usage, and smart phone usage fee with smart phone addiction. Also, there were significant negative relationships between self-esteem and optimism. Significant factors that affect smart phone addiction in middle school students were sex, self esteem, smart phone usage fee. These variables explained 10.8% of smart phone addiction. Conclusions: The results of this study reveal that the significant factors of smart phone addiction are sex and self-esteem. This study indicates that it is important to develop self esteem promotion programs that focus on sex trait in order to prevent smart phone addiction on adolescents.