The characteristic parameter about hollow waveguide is gained by using numerical method and the energy distribution model is made by using vector . thirdly we discuss the z - direction energy distribution in hollow waveguide and reflecting character on interface 我们还在对空芯光纤中径向能量分布和介质表面反射特性研究的基础上,给出了介质膜与常规界面的反射特性的差异。