A double metal-cladding structure which can achieve high contrast approaching unity and high-reflectivity is proposed. This double metal-cladding structure with sub-millimeter scale can accommodate a series of resonant modes. Using the Fresnel reflection formula of the four layers, the relationship between coupling efficiency and thickness of upper metal layer is analyzed and the optimum value of thickness of upper metal layer can also be obtained. It is also found that such optimum value is closely related to the intrinsic and radiative damping. The interference fringes of reflected beam and coupling efficiency on double metal-cladding structure were observed experimentally. Experimental results showed that high contrast approaching unity can be observed from interference fringes and coupling efficiency can reach nearly 100% on double metal-cladding structure. It is useful for the investigation of high contrast high reflectivity films and the sensors based on double metal-cladding structure.