JCA model is used to identify acoustic parameters of glass fiber according to the parameter identification technology of porous materials, based on Biot theory. The identification results are regarded as input parameters of the FE-SEA model of the double-wall to evaluate its sound transmission loss. Meanwhile, the sound transmission loss experiment of the double wall is carried out in a standard acoustic laboratory, and the experimental results are compared with the numerical results. The following conclusions are obtained: i) it is feasible to use acoustic parameters identification method for glass fiber, which can obtain accurate acoustic parameters and reduce experimental items and times; ii) it is reasonable to introduce the identification parameters into the prediction model of sound transmission loss of the double-wall, and the predicted results are in good agreement with experimental results. Therefore, the parameter identification method and FE-SEA method can be combined for the acoustic design of structures containing porous materials.