The shaking table tests of a steel structure with Innovative H type Steel-Unbuckling-Brace and conventional central brace are conducted to compare the dynamic characteristics and seismic responses of the two braces, especially the effect of the two braces on seismic behaviors of the structure. The finite element analysis based is carried out and compared with the experimental result. The results of tests and calculations show that the Innovative H type Steel-Unbuckling-Brace presented here provides certain stiffness as the conventional central brace and the layer displacement of the two frameworks is the same in normal using. But layer displacement of the framework with H type Steel-Unbuckling-Brace is far less than that of conventional brace in the middle and strong earthquakes, because of the SUB dissipating earthquake input energy before the framework working into elastic-plastic degeneration and reducing structural damage.