Abstract: A radome usually adopts single-layered structure design. However, its operating bandwidth is usually rather narrow, which is difficult to meet the requirements of broadband transmission. Moreover, for the case of larger incident angle of electromagnetic waves, the single-layered structure is difficult to meet the requirements. With the requirements of more widening of the operating bandwidth and more widening scanning range of radar seekers, the design of single-layered structure is rather difficult to meet the technical requirements. In order to meet the requirement of broadband transmission, this paper deduces the transmission performance of multi-layered dielectric plates based on the wave transmission analysis of dielectric plates. By using the particle swarm optimization algorithm (PSOA), the corresponding fitness function or target function is designed. The thicknesses of multi-layered dielectric plates are optimized under the condition of multi-frequency points and multi-incident angles. The results achieved can meet the requirements of broad band and large incident angle transmission.