This research improved the frame structure and advanced the energy-efficient system of frame structure with dual-beams, whose principles were introduced. The thermal performances of the beams and columns were also analyzed with fluent software by building a three-dimensional steady thermal conduction model. The results have shown that this system is energy saving by 59%, compared with frame system. The heat flow of the beams and columns has been reduced by 79%, which indicates that this system has a distinct energy-saving effect. With the cold and hot bridges reduced and a large area of the new wall materials used, there is no need to build outside and inside insulation, whose shortages are avoided. Because of these, this new system better meets the requirements of green ecological energy-efficient buildings.