It is foreseen that the marine transport will make a remarkable growth recently in the domestic transport of general cargo due to the energy crisis, etc. The authors introduce the newly developed marine transport system for general cargo and present the results of simulation study. The simulation is made for costwise and timewise comparison between the circuit transport system which is a distinctive feature of the newly developed system and the shuttle network transport system which stands for the conventional system. The results show that the circuit transport system has an advantage in transport cost over the shuttle network transport system in wide variety of cargo distribution.