This study aims to find out the effect of behavioural intervention, cognitive intervention, and sex intervention toward the aggressive behaviour of early childhood. The study is conducted at two non-formal institutions of Education on Early Childhood in Magelang. This study obtains the data from two experimental groups consisting of 14 early childhoods in which one group is treated by cognitive intervention and the other one is treated by behavioural intervention. This study applies factorial experimental design. The hypothesis on this study is analyzed by using "Variant Analysis". The result of this study shows that: 1) there is a significant difference on aggressive behaviour of early childhoods between male and female caused by the intervention; 2) there is an influence of cognitive and behavioural intervention toward aggressive behaviour; the change of aggressive behaviour caused by cognitive intervention is higher than behavioral intervention; 3) there is an influence caused by intervention of interaction and sex toward aggressive behaviour of early childhood.