According to the previous study, we have proved that, by using the symmetrical metal-cladding optical waveguide with millimeter scale and the free-space coupling technique, one millimeter order of Goos-H.nchen shift can be obtained due to the resonance effects and the increase of the penetration depth. On the basis of this, enhancement of Goos-H.nchen shift is demonstrated with a pair of symmetrical metal-cladding optical waveguides in a cascaded structure. It is experimentally shown that the Goos-H.nchen shift measured from a CCD detector is 2215 μm with a change of 43 pm in the light wavelength, which is just two times of that exhibited from a single waveguide. Experimental result agrees well with the theoretical prediction. This method shows potential application prospect in optical switching and filtering.