Purpose: The purpose of this study was to identify the relationship of anger, and its expression type to mental health and psychosomatic symptoms in children of multi-cultural families. Methods: The data were collected from 125 students in grades 4~6, and analyzed using descriptive statistics, cluster analysis, t-test, ANOVA, Tukey`s multiple comparison test were used with the SPSS/WIN 12.0 program. Results: Three anger-expression types were found; low anger expression, anger-out, anger-control/in type. There were significant difference in mental health and psychosomatic symptoms between the upper 25% and lower 25%groups of state-trait anger. Also, levels of state-trait anger and types of anger expression were associated with mental health and psychosomatic symptoms. Conclusion: Anger management programs for children in multi-cultural families are necessary to help them lower anger levels and control types of unfavorable anger expression such as the anger-out-in type.