The sound transmission performance of unidirectionally reinforced double-layer plates in the whole frequency range is studied. In the fully-coupled model of the plate, the sound transmission mode is divided into fluid-borne path and structure-borne path. Their sound transmission coefficients are calculated respectively, and the theoretical calculation formula of the total sound transmission loss of the plate is obtained. Based on the VA One software, the sound insulation performance of a specified plate is studied in the whole frequency range. According to the modal number of each subsystem, the bandwidth for analysis is divided into low, medium and high frequency ranges, respectively. Using FE, FE-SEA hybrid and SEA methods, the sound transmission loss is calculated. The results are found to be consistent with the theoretical calculation and the experimental measurement results. This work has important engineering significance for research of sound insulation performance of large and complex models.%针对单向加筋双层板全频段的声透射问题，采用全耦合模型形成流体声传输和结构声传输两个独立的路径，分别对其声透射系数进行理论计算，进而得出研究结构总隔声量的理论计算公式；基于VA One分析软件，对指定研究结构全频段的隔声特性进行研究，根据各子系统分析带宽内的模态数将全频段划分为低、中、高频，分别采用FE、FE-SEA和SEA方法完成隔声量的求解计算，理论计算和实验测量结果变化趋势相一致，有关结论与分析方法对大型复杂模型的隔声特性研究具有一定工程意义。
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