近年來受嚴重特殊傳染性肺炎（COVID-19)疫情的影響，加速了各級學校推動線上教學的腳步，在未出現突破性的教育策略與方案之前，線上即時互動與分享的教學，可提供更貼近現場教學的情境；疫情期間各級學校的線上課程。普遍應用免費的商業平台，為避免教學受到平台業者經營策略可能改變的影響，本研究運用雲端虛擬主機實務技術，建立線上即時互動教學的備援系統，在雲端建置串流伺服器，分別因應線上直播、師生互動與群組討論等網路教學需求，建置對應模組，並針對各式教學情境，進行模擬與測試，探討資源需求，作為相關應用參考。

In recent years, the impact of the COVIC-19 has accelerated the pace of online teaching in campus at all levels. Since the online teaching provides the real-time interaction and sharing that may more close to on-site teaching. Recently the online courses for all levels schools have widely employed free commercial platforms. In order to prevent teaching from being affected by the possible changes in the business strategies of the platform operators, this research uses the cloud technology to establish a backup system for online real-time interactive teaching; A streaming server was then built in the cloud while teaching modules were built for online teaching needs such as online live broadcast, teacher-student interaction, and group discussions. Simulations and tests are carried out for various teaching situations. The results show that the online educational modules may be used as a backup system for online teaching while the resource requirements are discussed as reference for related applications.