The aim of the current research is to reveal the effectiveness of the dialectical behaviour therapy in reducing oppositional defiant disorder among a sample of university students. It will trace the continuity of its effectiveness in reducing oppositional defiant disorder among a sample of university students (follow-up period). The research sample consisted of (5) students of male in Benha University. Their age ranges from 18-19 years old. And the research used Scale of oppositional defiant

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... order among the adolescents and the therapeutic program based on dialectical behaviour therapy the results of the research indicated that There is statistically significant differences between the scores rank means of the pre-application and those of the post-application of the experimental group on the oppositional defiant disorder scale, in favour of the postapplication and There are no statistically significant differences between the scores rank means of the experimental group in the post-application and those in follow-up-application of the oppositional defiant disorder scale.