隨著少子化現象的來臨，所帶來的教育問題也層出不窮，包括學校招生不足導致大量出現的校園閒置空間，要如何再利用朝向永續發展是值得探究之問題。校園閒置空間再利用是校園中的場地、教室等空間場所因使用人數減少、管理使用不當、維護經費不足狀況等因素而產生閒置情況，為避免造成資源上的浪費，依據使用者的需求，並顧及永續、安全、經濟及適用之規劃原則下，改變其原本空間與設施的用途，提供新的功能以讓學校師生或社區民眾共享，以達到再利用之用途。是故，本文將先探討少子化的現況與問題，再提出校園閒置空間再利用之意涵、原則、步驟及策略模式，希冀朝校園空間之永續發展著力，以對國內面臨裁併或轉型之學校有一定程度之裨益。

"Accompanying with the tendency of declining birth rate, more and more educational problems have come out, including large number of vacant school spaces because of fewer enrolling students. How to reuse these vacant spaces toward the direction of sustainable development becomes a worth-discussing issue.To avoid resource wasting, to fulfill the requirement of users, and to attend to the principle of sustainability, safety, economy, and suitability, the reuse of vacant school spaces, school spaces and classrooms leave unused because of decreasing users, improper management, and insufficient maintaining fund, is to change the original purpose of the space and facilities, and to afford new functions that can be shared by teachers, students, and people in the community.Thus, with the hope to help these schools facing cutting down and reforming, and to assist sustainable development of these schools, this article would firstly discuss the current situation and problems of declining birth rate, and then address the meaning, the principle, the steps, and the strategic models of the vacant school space reuse."