This paper tries to look at the de-radicalization activities carried out by Senior High Schools in the Metro City of Lampung Province, Indonesia. Allegedly there are certain Islamic educational institutions that teach both fundamentalism and radicalism.for this reason, educational institutions are very likely to spreade radicalism. Schools through the policy of religious formation and the work of teachers have a significant role in establishing the character and religious understanding of students. This study was meant to investigate the roles and forms of activities carried out in senior high schools in Metro City while working on the de-radicalization of students' religious understanding. The results of the study showed that senior secondary schools in Metro City have implemented deradicalization of education both programmatically and incidentally. The programmed way was through classroom learning and religious formation in extracurricular activities. On the other hand, incidental de-radicalization was carried out through extra-curricular activities in student dormitories for religious public schools and by means of Student Religion (Rohis) for public state schools. Religious development through IPNU and IPPNU organizations for private high schools affiliated to NU and religious coaching through HDI organizations for schools affiliated with Muhammadiyyah was widely practiced.