Adolescent violence is a growing problem in schools across the country. According to the author´s observation,school personnel generally lackof the knowledge of the origin and the appropriate course plan,Thepurpose of this study is to understand junior high students´ antisocial behavior patterns.The data were collected through the questionnaire rated bystudents,staffs,and six observers,and analyzed by SPSS.The impact of violence in the junior high school was examined.It idhypothesized that the school environment and community services ingeneral affect both the students´ academic performance and the delinquentbehavior.Four hundred and ninety-six students drawn from two junior highschools in Taipei(160 male and 160 female from school Ⅰ,88 male and88 female from school Ⅱ)participated in this research,The sample ofstaff subjects(n=136)consists of homeroom teachers and administers inboth schools.Thirty-seven staffs are invited to the meeting to share theiropinion on aggression prevention in the school.Twelve volunteered studentsfrom both schools are interviewed regarding school violence,Data aboutschool environment(school schedule and campus building)were collectedthrough natural observation by six college students from National TaiwanNormal University.Data collected from students and staffs analyzed,It is found that(1)mild and moderate aggressive behavior are more prominent than severeaggressive behaviors;(2)students tend not to trust school´s ablity toprotect them;(3)teachers generally lack of self confidence in dealingwith the students´ conflicts;(4)both students and staffs felt helpless andanxious about the situation;and(5)there are cognitive discrepanciesbetween students and teachers in valuing the quality amd the quantity ofschool violence.This study suggests that it is more effective if interventions takeplace at the ecological level.Future research on prevention and intervention are recommended.