This study aimed to acquire the dynamic characteristics of the components of the product transportation packaging system. With help of distributed decoupling method and inverse sub-structuring theory of two-level rigid coupling system, the theoretical formula was deduced for predicting the frequency response function of key components according to the frequency response function of products, the vehicle component level and the system level. The motor-washing machine-vehicle system was set up to verify the correctness of the theory. Based on online test and verification, the predicted frequency response function of key components based on the theory was consistent with the test value. The study results can provide reference for designing and optimizing transport packaging.