Purpose : This article was to study mental health status through aggression and stress of children of multicultural families, marriage immigrant and to use them as baseline data. Method : We used questionnaire and collected them from 135 children of multicultural families who live in 2 city and 4 do. Frequency Analysis was used for Demographic Characteristics, t-test and one-way ANOVA for aggression and stress depending on demographic characteristics, and regression analysis for the factors. Result : The first, the total score of aggression of the children of multicultural families was 3.05 and the most high score was verbal aggression, 3.69. Stress was 3.66. The second, there was a significant difference between aggression depending on demographic characteristics and verbal aggression(p=.031) depending on age and anger(p=.011). There was also a significant difference between total aggression(p=.028) depending on economic level and physical aggression(p=.049), verbal aggression(p=.000), anger(p=.036), hostility(p=.042), and stress(p=.011). The third, we analysed the factors affecting aggression of children of multicultural families. There was a significant difference resulting from stepwise regression analysis(F=57.139, p<.001), the results showed a strong explanation of aggression by bad in economic status(p<.01), stress(p<.01), 10 years in age(p<.01), and 13 years in age(p<.01). Conclusion : Aggression depending on demographic characteristics of the children of multicultural families was caused by age, economic level, and stress.