对二子系统的互易关系进行了阐述，给出了混合FE-SEA的系统方程。通过数值仿真，建立了声腔-平板-声腔系统的FE-SEA混合模型，同时建立了声腔-平板-声腔系统的SEA模型，对声腔模态密度、SEA模型中声腔与板的耦合损耗因子进行了计算，同时计算了FE板与SE板的辐射效率，并对2个模型进行了响应计算，分析了误差产生的原因，并将FE-SEA模型与SEA模型计算结果进行了对比，对比结果表明，二者在中高频段具有较好的一致性。同时还建立了声腔-轿车后风挡玻璃-声腔系统的FE-SEA混合模型，以及该系统的SEA模型，通过试验对内侧声腔激励进行了测量，计算了FE-SEA模型与SEA模型外侧声腔的响应声压级，并与试验结果进行了对比，对比结果表明，在中高频段FE-SEA模型与SEA模型的预测结果相吻合，且FE-SEA模型与试验结果有着较好的一致性。

The basic reciprocity relation for a random component was demonstrated, and the hybrid FE-SEA equation was given too. The hybrid FE-SEA model of cavity-plate-cavity system was built, and the SEA model of the system was built at the same time. The modal density of the sound cavity and the coupling loss factors between sound cavity and plate were calculated, and the radiation efficiencies of the FE plate and SE plate were also computed. The response of the cavity-plate-cavity system was calculated, and the response result of the FE-SEA model was compared with the response result of SEA model. The reasons of the error in SEA and hybrid FE-SEA model were analyzed. The contrast result indicates that the two models have a good consistency in mid-high frequency band. The hybrid FE-SEA model and SEA model of the cavity-rear windshield-cavity were also built. The excitation of the inside cavity was measured, and the response sound pressure levels(SPL) of the hybrid FE-SEA model and SEA model were calculated. The SPLs were compared with experimentation result, the contrast result indicates that the SPLs of the two models have a good consistency in mid-high frequency band, and the SPL of the hybrid FE-SEA model has a good consistency with experimentation too.