The objective of study was examining impacts of peers’ pressure, and the variable of self-esteem on levels of aggression at general secondary students, males and females. Aggression is known as any type of behavior meant to hurt others. Aggression always merges in the context of dealing among individuals (such as emotional and social difficulties, fewness of self-esteem, peers-discarding, and studying failure), environing character is tice (such as poverty, weakness of family supervisors, limited social support, and conflicts with the family) limiting factors that cause aggression are considered a vital matter to specify precautions of it. This qualitative rational research aims at examining impacts of variables of peers’ pressure, and self-esteem on prediction with levels of aggression at general secondary students. The sample of study consisted of 411 male and female students and they have been randomly chosen from 720 students and the general secondary students in Jerash governorate. The participants answered the questionnaire of aggression and scale of peers’-pressure, and scale of self-esteem in their classes during periods of research. Date had been analyzed by using hierarchy method analysis of using hierarchy method analyzing the multi-declension. It was pin-pointed that peers’ pressure was an effective predictor in explaining levels of aggression relative to hierarchy of analyzing the multi-declension of the general secondary students, males and females. Moreover, it was pin-pointed that self-esteem was in the second rank from part of the relationship with aggression amongst the general secondary students, males and females. It was clear that peers’ pressure had an impact indicative to the general secondary students’ aggression in the deeds connected with prevention of aggression, and it is necessary to teach the general secondary students how to adapt with pressure, and how to say “no”. Leaning on these results, we recommend that schools to students how to prevent violence and aggression. In addition to that, we recommend to use cognitive behavioural technicalities to raise the level of the general secondary students’ awareness with non-beneficial behaviour and motivating to aggression so that they can amend such behaviour.