There is little literature about applying cognitive therapy theory in group therapy for conflict management. Anderson (1994) reported that cognitive therapy theory could be used to observe and manage anger. The purpose of the study was to assess the effectiveness of applying cognitive therapy in group therapy to address anger. Patients were encouraged to identify their feelings about different thoughts and curtail reactions of anger in order to minimize hostile actions. Ten group therapy sessions were arranged, at which cognitive therapy was applied. During each session, members could share different thoughts, feelings and study conflict management skills. Members were given homework and also received telephone counseling to help them achieve cognition of their feelings. Cognitive therapy applied in the context of group therapy can help patients develop conflict management skills.