According to this theory, most of suicide in the West is of the latter type since mental illness, substance use disorders and alcohol use disorders are factors that most consistently associated with suicide. In China, however, a recent study about the psychological strain theory of suicide among Chinese adolescents has formed a challenge to the psychiatric model that is well-established in the West. Besides, Cui’s study among Chinese adolescents has revealed that the special problems related to peer relationships, especially physical fighting and lack of peer association, were significantly related to suicide behavior. A suicidal temperament/personality theory has suggested that impulsiveness, aggressiveness, anger, and hostility are crucial predispositions mediating suicidal behavior. As a result, we need to study the relationship between aggression and suicide to better understand the risk factors for suicide and suicide behavior in China. And further investigations should be done to explore how trait aggression predicts suicidal behavior among Chinese adolescents. The aim of the present study was to explore which forms of trait aggression were associated with suicidal behavior, as well as to reestimate the prevalence of suicide ideation, plans and attempts among adolescents of urban areas in China. Based on literatures reviewed above, we hypothesized that physical aggression, anger, and hostility would be risk factors of adolescents’suicidal behavior after adjusting for various risk factors. Data were Cyclosporine collected via an 84-item self-reported questionnaire by a group of trained interviewers in classrooms during regular school hours to maximize student eligibility. Before completing the questionnaire, students were told to read the instruction carefully, which informed them that honest answers were preferred and their answers would be for scientific research only. About one class hour were required to complete the questionnaire. Suicidal behavior was evaluated by four self-reported questions which had been found to be reliable sources of primary data about suicidality. They were “Have you ever thought about killing yourself during the past 12 months?”, “Have you ever made a specific plan about how you would kill yourself during the past 12 months?”, “How many times have you deliberately tried to kill yourself during the past 12 months?” and “If you attempted suicide during the past 12 months, what was the result of that attempt?” Participants were asked to answer the first three questions with “No” or “Yes”. Suicide attempters needed to answer the last one with four Trihexyphenidyl HCl options: be found and required medical care; be found and required no medical care; regretted and stop by yourself; unsuccessful due to other reasons. Depending on their answers, they would be considered categorically as suicide ideation, planner or attempter.