The study aimed to determine whether there is a statistically significant relationship between variables: Participation in the activities and psychological compatibility among ninth graders in the state of Seeb. The study sample consist of 320 students. Study tools were participation in the school activities questionnaire which content validity was measured, and psychological adjustment scale provided by (Mohammed,2015). The content validity of the scale was measured, internal consistency reliability was measured by using Cronbach equation, the results showed accepted reliability r=0.925. The most important findings of the study were positive relationship between school activities and psychological adjustment, and the results of the study indicated that there were statistically significant differences in psychological compatibility due to the type of school activity. In the light of the previous findings, this study recommended the necessity of activating the role of the school in the areas of activities and convincing parents of their educational importance to encourage their children to participate in various programs. In addition of the need to benefit from the private sector in supporting the activities of student activity and highlighting the activities through the provision of supporting programs and means and equipment. In addition to conducting, a scientific study aimed at identifying the relationship between school activities and psychological and social adjustment with other variables.