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The aggresiveness of children in Jakarta has increase recently and it shows that the school-age student aggresiveness also elevated and could lead to criminal behaviour in the future. Aggressive behavior that is not treated early is expected to allow for even greater aggressive behavior to emerge in the coming year. The aim is to test the effect of emotion regulation training on reducing the level of aggression in elementary school students. The study design was quasi-experimental with one group pretest-posttest. The emotion regulation training consist of 4 stages which are applied to 30 selected elementary school students. The questionnaire were self-made and the Buss'–Perry Aggression Questionnaire and has been tested. The results of the statistical test on the level of aggression showed that p value <0.000, which meant that there was a significant difference in the level of aggression before and after being given emotional regulation training. The results of the Chi Square test showed that the P value of emotional status was 0.013, which means that the emotional status influencing children's aggressive behavior. The conclusion of the study is that emotional regulation training reduce the level of child aggression and it is influenced by the child's emotional status.