The aim of the current research is to reveal the depth of knowledge of the primary school students, as the research community was identified with the sixth grade students of the primary stage from the first, second and third directorates of Rusafa Education, where the number of the sample was (250) students. The descriptive approach was used, where the researcher built a special test of cognitive depth for sixth grade students, consisting of (20) questions, of whom (16) objective questions and (3) articles to know their depth of knowledge. The psychometric properties of them, as the reliability coefficient of the cognitive depth test was )0.86( The results resulted in the following: Sixth grade students in the research sample possessed the cognitive depth.