This study aimed to structure a scale for Aggression Behavior of the students of the After Basic Education in the Sultanate of Oman .The sample of the Study consisted of 1000 students (500 male and 500 female). Who were randomaly selected from Muscat Region and Batinah South Region. It was also taken into consideration all the sicomeatic measuns in constructing a scale of 66 items to scale physical aggression, verbal aggression and emotional aggression. The validity of the scale was verified using two methods content validity and criterion-related validty.Whereas, the reliability of the scale was assured by using Cronbach's Alpha factor. The results indicated acceptable reliability and validity for this scale. The results of the confirmatory factor analysis indicated that the scale is consisted of 3 factors which are: physical aggression, verbal aggression and emotional aggression. Which is aligned with the theoretical frame of research. Finally, norms for both males and female were derived using t-scorer and percentile ranks. The approach that was followed in this study was a descriptive approach and using appropriate statistical methods to answer the research's questions like Cronbach's Alpha factor, Pearson correlation coefficient, confirmatory factor analysis, t-scorer and percentile ranks. The results were discussed in the light of the theoretical frame and the previous studies. Also number of recommendations and suggestion have been shown.