本文从理论上研究了金属包复四层波导中的表面模,指出可以在其中激发长程表面模.用角度扫描衰减全反射方法研究了这种波导中的长程表面模,测量了其传播常数和损耗与波导参数的关系.实验结果和理论计算相符. In this paper, we study the surface modes in a metal-clad four-layer waveguide theoretically, and point out that the long-range surface modes can be excited in them. The long-range surface modes in this waveguide are studied by the angular-sweep attenuated total reflection method. Loss and waveguide parameters.The experimental results are consistent with the theoretical calculations.