Thermal activated envelope technology, also known as active insulation technology, is a method of exploring how to achieve low energy consumption and maintain indoor temperature by actively changing the temperature gradient of the envelope insulation layer. Unlike the mainstream technologies in building structure thermal activated technology (TABS), such as slab thermal activated technology, the thermal performance changes brought about by envelope thermal activated technology are greater, and the application of low-grade energy is more comprehensive. By comparing the cold and heat load allocation methods with the entransy dissipation of radiation heat exchange end, a design idea beneficial to building energy saving was found for constructing a composite system. Viewing the building envelope as an open system for material and energy input/output, creating a good indoor thermal comfort environment essentially involves achieving a dynamic balance of matter and energy.