The aim of this research is to determine relationship betwen emotional maturity with the aggressivity of mobile legends online game players.This research uses quantitative corelation method. The population in this study were were vocational students playing legendary mobile games.The sample include in this research are 141 vocational students play mobile legends games. Measurement by self report is this used in this study consisted of 2 scale. The emotional maturity 30 aitems with reliability coefficient α= 0,859. The aggresiveness scale consist 0f 22 items reliability α=0,888. Analysis used by product moment. The result showed that correlation between emotional maturity with aggresiveness skore rxy= -0,623 F= 88,262 p=0,000 (p<0,01). The result show that there is a significant negative relationship between emotional maturity with aggresivenes.

Keywords: Emotional Maturity, Aggressiveness.