Abstract: The envelope is the important part of the building. Therefore, it has always been a technical hot-pot in the research of energy conservation on prefabricated buildings. In the current foreign literature, the research object of energy saving on prefabricated building envelope structure is mostly composite structure, and the research content is more diversified. however, domestic research is still dominated by single structure, and research on thermal performance and energy-saving technology of prefabricated buildings is relatively scarce. This paper summarizes the research status of different structural energy-saving systems of the outer envelope of prefabricated buildings at home and abroad, and points out that China should pay more attention to the localized energy-saving design of mixed structural forms in the future, and the outer envelope structural system with the best energy-saving effect should be determined according to the climatic environment characteristics of each climate zone.