PURPOSE The purpose of this study is to explore the educational method and its practical strategy that help foster the community spirit in Catholic schools as it regards schools as community. CONTENTS This study intended to approach Catholic schools in community aspect as an alternative solution that can encourage to cope with various problems at schools. First, it explored the social background that created the term ‘community’ and the concept of the community applied in Catholic ecclesiology. Second, it examined the definition of ‘synodalitas’ and its practical method, for it is perceived as the tool to edify the community spirit in Catholic schools. Third, it introduced the preventive system of Don Bosco that can be applicable in fostering the community spirit, since the preventive system composed of religion, reason, and loving-kindness, can be an strategy to preserve the Catholic values and restore the community spirit in Catholic schools. RESULTS The preventive system can be a proper tool to recover the community spirit in Catholic schools; First, it can motivate community members to practice and share the Catholic values and mission. Second, the preventive system can lead community members to build relationships regardless their roles and social positions, while transforming their attitudes and behaviors. Third, the practice of ‘assistenza’ promotes school environment to be familiar and familial that help enhance the community spirits as a practical strategy.