Ro ro transportation refers to a maritime transportation mode that uses ro ro ships to transport goods together with vehicles. The transportation objects are mainly containers and other group goods, which are generally transported by trailers or trucks. After getting on the ship, they will be transferred to multiple cargo compartments on multi-storey deck. Trailers and trucks will also be transported together with the goods without being loaded back. The utility model has the advantages of convenient loading and unloading and low cost. It is suitable for Gulf transportation. In recent years, it began to develop to ocean transportation.