In view of the problem that the height difference between the shipping terminal and the user terminal is too large to select the appropriate ship type for the whole transportation of the ship unloader and roll-on,we select the combination of barges and semi-submersibles to complete the roll-off of the ship unloader with the stacking ship scheme,determine the ship unloader transportation and roll-off ship type,site construction methods and process points rationally,and carry out the finite element analysis of passing bridge.The results show that the stress and deflection of the bridge can satisfy the requirements.The stacking ship scheme achieves the marine transportation of the whole ship unloader and the standardization and safety of the ship unloader roll-on process.