This research was conducted due to the students’ high aggressiveness either physically or verbally and either directly or indirectly such as hitting, kicking, speaking harshly, berating, destroying stuffs, and even hurting and harming others. This was an experimental research which used pretest-posttest control group design to see the effectiveness of information service using role playing approach to reduce the students’ aggressiveness. The population was students in class VII SMP Negeri 15 Padang. By using random sampling technique, class VII.3 and VII.5 were chosen as the sample.the data of students’ aggressiveness were gathered bt using Likert Scale model, The data obtained analyzed by using the Wilcoxon Signed Ranks Test intended to see the difference between the score mean of the students’ aggressiveness before and after treatment given to both experimental and control group, and Kolmogorov-Smirnov 2 Independent Samples to see intended to see difference between af the score mean of the students’ aggressiveness in the experimentalgroup and in the control group, by using computer program. The findings of this research were: (1) there was a significance difference between the aggressiveness score mean of the student in experimental group before and after information service using role playing approach given, (2) there was difference between the aggressiveness score mean of the student in control group before and after information service without using role playing approach given but it’s not significance, and (3) there was a significance difference between the aggressiveness score mean of the students treated by making use of information service using role playing approach and those given information service without using role playing approach. It was concluded that giving information service using role playing approach to the students is effective to reduce their aggressiveness