Aggression was analyzed in 72 children between the ages of 6 - 9 years old of low and middle socioeconomic levels in Metropolitan Lima using a non-probability sample. The Rorschach Psychodiagnosis was used, according to Exner's Comprehensive System and the aggression variables proposed by Baity and Hilsenroth (1999) and defined by Exner (1994), Holt (1971), and Gacono and Meloy (1994). Using this methodology, it was discovered that ContAg is the most elevated measure; differences were also found in AG, ContAg, and A2 in children; and differences in AgPot were discovered in children of low socioeconomic levels. Finally, the theoretical association between the distinct variables of aggression was confirmed in two factors: primary aggression and secondary aggression, proposed by Bairy and Hilsenroth (1999).