In the cigarette secondary distribution transportation system, the cage vehicle, the cushion package, the carrying vehicle and the road form of a complicate dynamics system. With dynamic modeling of the complicate system and reliability of the cage vehicle as research contents, sets up a system model by using the rigid-flexible coupling theory. Meanwhile uses the random input and impulse excitation to simulate the actual road and simulates the transportation smoothness. By analyzing changing curves of the acceleration of main cage and auxiliary cage, obtains the transport smoothness difference at different speeds under the same road condition, and through analyzing the acceleration power spectral density curve, obtains the main concentration frequency range of the vibration energy of the goods. It provides data support for the vehicle body design and maximum speed limit.