介绍了介质壁加速器(DWA)的原理和几种可能实现的结构。通过对多层介质圆柱的平面波电磁散射的研究，用FORTRAN语言编写程序计算和分析了DWA加速管三层介质柱体结构的平面波电磁散射的散射宽度与几何结构参数、材料参数的关系，用以优化设计介质壁加速管结构。计算结果表明：当加速管材料和等势环介电常数一定时，平面波电磁散射宽度随半径增大而增大；当加速管内外径一定时，加速管材料和等势环介电常数增大时散射宽度变化不明显，但最小散射宽度显著减小。当加速管半径和材料一定时，总能找到使散射宽度达到最小的等势环介质厚度。

The paper introduces the principle and some feasible structures of dielectric wall accelerator(DWA). By the study of electromagnetic scattering of multilayer dielectric cylinders, the relation of scattering width, parameters of materials and structure of beam pipe of DWA is investigated with FORTRAN program, for designing the accelerating beam pipe of DWA with high accelerating gradient and high energy coupling efficiency. The results confirm that， with permittivities of dielectric cylinders fixed, the scattering width becomes larger when the radiuses get larger. With radiuses of dielectric cylinders fixed, the scattering width shows no obvious change when the permittivities become larger, but the minimal scattering width becomes smaller. When the radiuses and permittivities of the first and the second layers are given,there is always a third layer thickness at which the scattering width is minimum.