With variable assumed sandwich model, the vibration and acoustic characteristics are distinct. Based on the displacement field assumption of the Reissner and Zig-Zag model, the paper established two kinds of composite sandwich plate Finite Element models, and its inherent frequency and Eigen-mode shapes were required by subspace iteration method with the help of the derivation model program. The paper also calculated the acoustic transmission loss by transmission theory of diffused sound field, and studied the numerical simulation of vibration and sound transmission character, the application of sandwich plate's face and core with variable thickness ratio and elastic modulus ratio were considered as well.%不同模型假定下夹层结构的声振特性各不相同。基于Reissner模型和Zig-Zag模型位移场假设，分别建立了两种复合材料夹层板有限元动力单元模型，并通过推导的模型编制了计算程序，采用子空间迭代法求得了其固有频率和固有振型，采用混响声场声传输理论计算了传声损失，并对夹层板的动力特性和声传输特性进行了数值模拟研究，同时还考虑了夹层结构面板与芯板的厚度比和弹性模量比不同时各种模型的适用范围。
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