Objective To evaluate the mental health conditions of junior school students in Kaifeng and make it clear the relationships between sport exercises and. Method To carry out a survey among 313 junior school students by the combination of Mental Health Tests and sports intervention. Results It manifests that the mental health conditions of junior school students have quite a few problems yet in not very serious degree. The emotional anxiety ratio in the key junior school is 44.30 % with a very serious degree; while in common junior school is 58.33 % yet is not that serious. Sport exercises play a significant role in reducing the mental problems. The difference of the scores before and after sports may mean something in statistics（p<0.05）. Conclusion We must by no means overlook the emotional anxiety of the students either in common or key junior schools. Sport exercises will help students to release the mental pressure.