This study aimed at identifying effectiveness of cognitive behavior therapy art (CBTart) program on reducing oppositional defiant disorder (ODD) in children who aged (7 -12) years in Khartoum state. The researchers have been used the experimental research, and that to measurement the cognitive behavior therapy art (CBTart) program for children who aged (7-12) years which is set up by the researchers themselves. And at the same time, the probability reduction of oppositional defiant disorder (ODD) in these children it did guarantee. Therefore, after stating that the cognitive behavior therapy art (CBTart) program has an excellent psychometric properties, it immediately set up to be applied to (35) boys and girls of ages (7-12). In order to evaluate the reduction effects from pre- to post-test, reduction conditions were compared using (SPSS) which is measured by; paired samples t-test and Independent-Samples T-Test. Eventually, the results suggested that: there are significant differences in program effectiveness of cognitive behavior therapy art (CBTart) for children who aged (7-12) years in favor of a post- test. There are also significant differences in program effectiveness of cognitive behavior therapy art (CBTart) for children who aged (7 -12) years in favor of a gender variable. Finally, the researchers have many recommendations, but their most important recommendation is that: applying cognitive behavior therapy art (CBTart) program to children of all ages; in addition to that, the program has to be unified, so that it can be beneficially used for them